Datasheet

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Charge Pump, 7-Channel

Smart LED Driver with I

C Interface

ADP8860

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

07967-001

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700 www.analog.com

FEATURES

Charge pump with automatic gain selection of 1×, 1.5×, and

2× for maximum efficiency

Up to two built-in comparator inputs with programmable

modes for ambient light sensing

Outdoor, office, and dark modes for maximum backlight

power savings

7 independent and programmable LED drivers

6 drivers capable of 30 mA (typical)

1 driver capable of 60 mA (typical)

Programmable maximum current limit (128 levels)

Standby mode for <1 μA current consumption

16 programmable fade in and fade out times

0.1 sec to 5.5 sec

Choose from linear, square, or cubic rates

Fading override

C-compatible interface for all programming

Dedicated reset pin and built-in power-on reset (POR)

Short-circuit, overvoltage, and overtemperature protection

Internal soft start to limit inrush currents

Input-to-output isolation during faults or shutdown

Operation down to V

= 2.5 V with undervoltage lockout

(UVLO) at V

= 2.0 V

Small wafer level chip scale package (WLCSP) or lead frame

chip scale package (LFCSP)

APPLICATIONS

Mobile display backlighting

Mobile phone keypad backlighting

Dual RGB backlighting

LED indication

General backlighting of small format displays

GENERAL DESCRIPTION

The ADP8860 combines a programmable backlight LED charge

pump driver with automatic phototransistor control. This combi-

nation allows for significant power savings because it changes the

current intensity in office and dark ambient light conditions. By

performing this function automatically, it eliminates the need for

a processor to monitor the phototransistor.

The light intensity thresholds are fully programmable via the

C® interface. A second phototransistor input, with dedicated

comparators, improves the ambient light detection levels for

various user operating conditions.

TYPICAL OPERATING CIRCUIT

D6/

CMP_IN2

ALS

OUT

OPTIONAL

PHOTOSENSOR

PHOTOSENSO

CMP_IN

0.1µF

1µF

VDDIO

nRST

VDDIO

SDA

VDDIO

SCL

VDDIO

nINT

GND1

GND2

C2+

C2–

1µF

C1+

C1–

1µF

OUT

ADP8860

1µF

Figure 1.

The ADP8860 allows as many as six LEDs to be independently

driven up to 30 mA (typical). A seventh LED can be driven to

60 mA (typical). All LEDs are programmable for minimum/max-

imum current and fade in/out times via the I

C interface. These

LEDs can also be combined into groups to reduce the processor

instructions during fade in/out.

Driving this entire configuration is a two-capacitor charge pump

with gains of 1×, 1.5×, and 2×. This setup is capable of driving a

maximum I

OUT

of 240 mA from a supply of 2.5 V to 5.5 V. The

device includes a variety of safety features including short-circuit,

overvoltage, and overtemperature protection. These features

allow easy implementation of a safe and robust design. Addi-

tionally, input inrush currents are limited via an integrated soft

start combined with controlled input-to-output isolation.

The ADP8860 is available in two package types, either a compact

2 mm × 2.4 mm × 0.6 mm WLCSP (wafer level chip scale package)

or a small LFCSP (lead frame chip scale package).

Summary of content (52 pages)

PAGE 1
Charge Pump, 7-Channel Smart LED Driver with I2C Interface ADP8860 FEATURES VALS OPTIONAL PHOTOSENSOR VOUT PHOTOSENSOR 0.1µF D1 D3 VIN D2 E3 D3 D4 E4 D5 D4 B4 B3 C3 D6/ CMP_IN2 A3 1µF 1µF E1 VDDIO SDA A1 ADP8860 C1 C2 VDDIO B1 SCL E2 B2 VDDIO nINT VOUT A2 VDDIO nRST 0.1µF D7 CMP_IN C4 C1+ C1– C1 1µF C2+ C2– C2 1µF D2 A4 GND1 D1 GND2 07967-001 Charge pump with automatic gain selection of 1×, 1.
PAGE 2
ADP8860 TABLE OF CONTENTS Features .............................................................................................. 1 Backlight Turn On/Turn Off/Dim ........................................... 17 Applications ....................................................................................... 1 Automatic Dim and Turn Off Timers ..................................... 18 General Description ......................................................................... 1 Fade Override .........
PAGE 3
ADP8860 SPECIFICATIONS VIN = 3.6 V, SCL = 2.7 V, SDA = 2.7 V, nINT = open, nRST = 2.7 V, CMP_IN = 0 V, VD1:D7 = 0.4 V, C1 = 1 μF, C2 = 1 μF, COUT = 1 μF, typical values are at TA = 25°C and are not guaranteed, minimum and maximum limits are guaranteed from TA = −40°C to +85°C, unless otherwise noted. Table 1.
PAGE 4
ADP8860 Parameter AMBIENT LIGHT SENSING COMPARATORS Ambient Light Sensor Current DAC Bit Step Threshold L2 Level Threshold L3 Level FAULT PROTECTION Startup Charging Current Source Output Voltage Threshold Exit Soft Start Short-Circuit Protection Output Overvoltage Protection Activation Level OVP Recovery Hysteresis Thermal Shutdown Threshold Hysteresis Isolation from Input to Output During Fault Time to Validate a Fault I2C INTERFACE VDDIO Voltage Operating Range Logic Low Input 2 Logic High Input 3 I2C TI
PAGE 5
ADP8860 I2C TIMING DIAGRAM SDA tLOW tR tF tSU, DAT tF tHD, STA tSP tBUF tR SCL S tHD, DAT tHIGH tSU, STA Sr P S 07967-002 S = START CONDITION Sr = REPEATED START CONDITION P = STOP CONDITION tSU, STO Figure 2. I2C Interface Timing Diagram Rev.
PAGE 6
ADP8860 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter VIN, VOUT D1, D2, D3, D4, D5, D6, and D7 CMP_IN nINT, nRST, SCL, and SDA Output Short-Circuit Duration Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Soldering Conditions ESD (Electrostatic Discharge) Human Body Model (HBM) Charged Device Model (CDM) 1 Rating −0.3 V to +6 V −0.3 V to +6 V −0.3 V to +6 V −0.
PAGE 7
ADP8860 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS D4 D5 CMP_IN D6/CMP_IN2 D7 ADP8860 1 2 3 4 5 ADP8860 TOP VIEW (Not to Scale) 2 3 4 C1+ VOUT VIN GND1 C2+ C2– D7 D6/ CMP_IN2 C1– SDA CMP_IN D5 GND2 nINT D1 D4 nRST SCL D2 D3 A 20 19 18 17 16 D3 D2 D1 SCL nRST PIN 1 INDICATOR 1 B 15 GND1 14 VIN 13 VOUT 12 C2+ 11 C1+ C TOP VIEW (BALL SIDE DOWN) Not to Scale 07967-004 NOTES 1. CONNECT THE EXPOSED PADDLE TO GND1 AND/OR GND2.
PAGE 8
ADP8860 TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.6 V, SCL = 2.7 V, SDA = 2.7 V, nRST = 2.7 V, VD1:D7 = 0.4 V, CIN = 1 μF, C1 = 1 μF, C2 = 1 μF, COUT = 1 μF, TA= 25°C, unless otherwise noted. 2.0 35 VIN = 3.6V ID1:D7 = 30mA IOUT = NO LOAD 1.8 30 1.6 25 1.4 IOUT (mA) 1.0 0.8 20 D1 15 D2 0.6 D3 10 D4 –40°C +25°C +85°C +105°C 2.0 2.5 3.0 3.5 4.0 4.5 5.0 D6 D7 5.5 VIN (V) 0 Figure 5. Typical Operating Current, G = 1× 0 0.6 0.8 1.0 1.2 1.4 1.6 1.8 35 34 4.0 33 3.5 32 3.
PAGE 9
ADP8860 35 1.0 VIN = 3.6V ID1:D7 = 30mA IOUT = 100mA 0.9 30 0.8 0.7 20 ROUT (Ω) 15 0.5 0.4 0.3 10 –40°C +25°C +85°C +105°C 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 –40°C +25°C +85°C +105°C 0.2 0.1 2.0 VHR (V) 0 2.0 07967-106 5 0 0.6 3.0 3.5 4.0 4.5 5.0 5.5 VIN (V) Figure 11. Typical Diode Current vs. Current Sink Headroom Voltage (VHR) 1 2.5 07967-109 IOUT (mA) 25 Figure 14. Typical ROUT (G = 1×) vs. VIN 10 VIN = 3.6V VD1:D7 = 0.
PAGE 10
ADP8860 1.4 1.3 0.9 450 0.8 400 0.7 350 0.6 300 0.5 250 0.4 200 0.3 150 0.2 100 1.1 1.0 IIN (mA) EFFICIENCY (%) IALS (mA) 1.2 0.9 4.0 4.5 5.0 5.5 VIN (V) 0 2.5 VIN = 3V GAIN = 2× IOUT = 10mA 400 EFFICIENCY (%) 0.7 5.1 5.0 4.9 0.2 4.6 0.1 JUNCTION TEMPERATURE (°C) 250 200 0.4 4.7 110 300 0.5 0.3 80 350 0.6 4.8 50 0 5.5 0.9 0.8 20 5.0 450 5.2 –10 4.5 1.0 5.3 4.5 –40 4.0 Figure 20. Typical Efficiency (Low Vf Diode) 07967-113 VOUT (V) 5.4 3.
PAGE 11
ADP8860 VIN = 3.7V T VIN (AC-COUPLED) 50mV/DIV 1 VOUT (1V/DIV) VOUT (AC-COUPLED) 50mV/DIV 2 2 IIN (10mA/DIV) IIN (AC-COUPLED) 10mA/DIV 500ns/DIV 4 Figure 23. Typical Operating Waveforms, G = 1.5× T 1 VOUT (AC-COUPLED) 50mV/DIV 2 IIN (AC-COUPLED) 10mA/DIV 07967-119 3 500ns/DIV 100µs/DIV Figure 25. Typical Start-Up Waveform VIN (AC-COUPLED) 50mV/DIV CIN = 1µF, COUT = 1µF, C1 = 1µF, C2 = 1µF VIN = 2.5V IOUT = 120mA IOUT (10mA/DIV) Figure 24. Typical Operating Waveforms, G = 2× Rev.
PAGE 12
ADP8860 THEORY OF OPERATION The ADP8860 allows up to seven LEDs to be independently driven up to 30 mA (typical). The seventh LED can also be driven to 60 mA (typical). All LEDs can be individually programmed or combined into a group to operate backlight LEDs. A full set of safety features including short-circuit, overvoltage, and overtemperature protection with input-to-output isolation allow for a robust and safe design.
PAGE 13
ADP8860 POWER STAGE Because typical white LEDs require up to 4 V to drive them, some form of boosting is required over the typical variation in battery voltage. The ADP8860 accomplishes this with a high efficiency charge pump capable of producing a maximum IOUT of 240 mA over the entire input voltage range (2.5 V to 5.5 V).
PAGE 14
ADP8860 STBY EXIT STBY STATUP: CHARGE VIN TO VOUT 0 EXIT STARTUP 1 VOU T > VOUT(START) 0 WAIT 100µs (TYP) G=1 MIN (VD1:D7) < VHR(UP) 1 G = 3/2 1 WAIT 100µs (TYP) MIN (VD1:D7) < VHR(UP) 1 0 0 MIN (VD1:D7) > VDMAX 0 1 WAIT 100µs (TYP) MIN (VD1:D7) < VDMAX 07967-012 G=2 NOTES 1. VDMAX IS THE CALCULATED GAIN DOWN TRANSITION POINT. Figure 27.
PAGE 15
ADP8860 SHUTDOWN VIN CROSSES ~2.05V AND TRIGGERS POWER ON RESET VIN nRST MUST BE HIGH FOR 20µs (MAX) BEFORE SENDING I2C COMMANDS BIT nSTBY IN REGISTER MDCR GOES HIGH ~100µs DELAY BETWEEN POWER UP AND WHEN I2C COMMANDS CAN BE RECEIVED nSTBY nRST IS LOW, WHICH FORCES nSTBY LOW AND RESETS ALL I2C REGISTERS 25µs TO 100µs NOISE FILTER nRST VIN ~3.75mA CHARGES VOUT TO VIN LEVEL SOFT START 1.5× 2× 1× GAIN CHANGES ONLY OCCUR WHEN NECESSARY, BUT HAVE A MIN TIME BEFORE CHANGING 10µs 100µs Figure 28.
PAGE 16
ADP8860 By default, the backlight operates at daylight level (BLV = 00), where the maximum brightness is set using Register 0x09 (BLMX1). A daylight dim setting can also be set using Register 0x0A (BLDM1). When operating at office level (BLV = 01), the backlight maximum and dim brightness settings are set by Register 0x0B (BLMX2) and Register 0x0C (BLDM2).
PAGE 17
ADP8860 BACKLIGHT MAXIMUM AND DIM SETTINGS Table 5. Available Fade In and Fade Out Rates The backlight maximum and dim current settings are determined by a 7-bit code programmed by the user into the registers previously listed in the Backlight Operating Levels section. The 7-bit resolution allows the user to set the backlight to one of 128 different levels between 0 mA and 30 mA.
PAGE 18
ADP8860 The backlight turns on when BL_EN = 1. The backlight turns off when BL_EN = 0. BACKLIGHT CURRENT BACKLIGHT CURRENT DIM TIMER RUNNING DIM TIMER RUNNING MAX MAX DIM BL_EN = 0 Figure 34. Dim Timer While the backlight is on (BL_EN = 1), the user can change to the dim setting by programming DIM_EN = 1 in Register 0x01. If DIM_EN = 0, the backlight reverts to its maximum setting.
PAGE 19
ADP8860 These comparators have two programmable trip points (L2 and L3) that select among three of the backlight operation modes (daylight, office, and dark) based on the ambient lighting conditions. DIM TIMER RUNNING MAX The L3 comparator controls the dark-to-office mode transition. The L2 comparator controls the office-to-daylight transition (see Figure 38). The currents for the different lighting modes are defined in the BLMXx and BLDMx registers (see the Backlight Operating Levels section).
PAGE 20
ADP8860 contains programmable hysteresis, meaning that the photosensor output must rise above L3_TRP + L3_HYS before L3_OUT clears. L3_CMPR is enabled via the L3_EN bit. The L3_TRP and L3_HYS values of L3_CMPR can be set between 0 μA and 137.7 μA (typical) in steps of 0.54 μA (typical). L2_TRP L2_HYS L3_TRP 1 10 ADC RANGE (µA) 100 1000 07967-025 L3_HYS Figure 40. Comparator Ranges Note that the full-scale value of the L2_TRP and L2_HYS registers is 250 (decimal).
PAGE 21
ADP8860 Program all fade, on, and off timers before enabling any of the LED current sinks. If ISCx is on during a blink cycle and SCx_EN is cleared, it turns off (or fades to off if fade out is enabled). If ISCx is off during a blink cycle and SCx_EN is cleared, it stays off. SCx CURRENT ON TIME FADE-IN ON TIME FADE-OUT FADE-IN FADE-OUT MAX voltage, the ADP8860 detects when the output voltage rises to VOUT(REG).
PAGE 22
ADP8860 STBY 0 EXIT STBY 1 TSD FAULT DIE TEMP > TSD EXIT STBY 0 1 STARTUP: CHARGE VIN TO VOUT DIE TEMP < TSD – TSD(HYS) SCP FAULT 0 VOUT > VOUT(START) 1 0 EXIT STARTUP VOUT < VOUT(SC) 0 1 VOUT < VOVP – VOVP(HYS) 0 0 G=1 WAIT 100µs (TYP) MIN (VD1:D7) < VHR(UP) 1 VOUT > VOVP 1 OVP FAULT 1 1 0 VOUT < VOVP – VOVP (HYS) 0 G = 3/2 WAIT 100µs (TYP) MIN (VD1:D7) < VHR(UP) 0 0 MIN (VD1:D7) > VDMAX VOUT > VOUT(REG) 1 1 1 0 OVP FAULT TRY TO REGULATE VOUT TO VOUT(REG) 1 VOUT > VOV
PAGE 23
ADP8860 • INTERRUPTS There are five interrupt sources available on the ADP8860. • • Main light sensor comparator: CMP_INT sets every time the main light sensor comparator detects a threshold (L2 or L3) transition (rising or falling conditions). Sensor Comparator 2: CMP2_INT interrupt works the same way as CMP_INT, except the sensing input derives from the second light sensor. The programmable thresholds are the same as the main light sensor comparator.
PAGE 24
ADP8860 APPLICATIONS INFORMATION The ADP8860 allows the charge pump to operate efficiently with a minimum of external components. Specifically, the user must select an input capacitor (CIN), output capacitor (COUT), and two charge pump fly capacitors (C1 and C2). CIN should be 1 μF or greater. The value must be high enough to produce a stable input voltage signal at the minimum input voltage and maximum output load. A 1 μF capacitor for COUT is recommended.
PAGE 25
ADP8860 • bypass capacitor on this pin. If the nRST pin is not used, it must be pulled well above the VIH(MIN) level (see Table 1). Do not allow the nRST pin to float. The ADP8860 has an integrated noise filter on the nRST pin. Under normal conditions, it is not necessary to filter the reset line. However, if exposed to an unusually noisy signal, then it is beneficial to add a small RC filter or EXAMPLE CIRCUITS VALS OPTIONAL PHOTOSENSOR VOUT PHOTOSENSOR 0.
PAGE 26
ADP8860 I2C PROGRAMMING AND DIGITAL CONTROL The ADP8860 provides full software programmability to facilitate its adoption in various product architectures. The default I2C address is 0101010x (x = 0 during write, x = 1 during read). Therefore, the default write address is 0x54 and the read address is 0x55. Note the following general behavior of registers: • • • All registers are read/write unless otherwise specified. Unused bits are read as zero.
PAGE 27
ADP8860 Address 0x20 0x21 0x22 0x23 0x24 Register Name L3_HYS PH1LEVL PH1LEVH PH2LEVL PH2LEVH Description L3 hysteresis First phototransistor ambient light level—low byte register First phototransistor ambient light level—high byte register Second phototransistor ambient light level—low byte register Second phototransistor ambient light level—high byte register Table 8.
PAGE 28
ADP8860 Manufacturer and Device ID (MFDVID)—Register 0x00 This is a read-only register. Table 9. MFDVID Manufacturer and Device ID Bit Map Bit 7 Bit 6 0 Bit 5 Manufacture ID 0 Bit 4 0 Bit 3 0 Bit 2 0 Bit 1 Device ID 1 Bit 0 1 1 Mode Control Register (MDCR)—Register 0x01 Table 10. MDCR Mode Control Bit Map Bit 7 Reserved Bit 6 INT_CFG Bit 5 nSTBY Bit 4 DIM_EN Bit 3 Reserved Bit 2 SIS_EN Bit 1 CMP_AUTOEN Bit 0 BL_EN Table 11.
PAGE 29
ADP8860 Mode Control Register 2 (MDCR2)—Register 0x02 Table 12. MDCR2 Bit Map Bit 7 Bit 6 Reserved Bit 5 Bit 4 SHORT_INT Bit 3 TSD_INT Bit 2 OVP_INT Bit 1 CMP2_INT Bit 0 CMP_INT Table 13. Bit Descriptions for the MDCR2 Register Bit Name N/A SHORT_INT Bit No. 7:5 4 TSD_INT 3 OVP_INT 2 CMP2_INT 1 CMP_INT 0 1 Description 1 Reserved. Short-circuit error. 1 = a short-circuit or overload condition on VOUT was detected. 0 = no short-circuit or overload condition has been detected.
PAGE 30
ADP8860 Bit Name CMP_IEN Bit No. 0 Description When the CMP_INT status bit is set after an enabled comparator trips, an interrupt is raised if the CMP_IEN flag is enabled. 1 = the main comparator interrupt is enabled. 0 = the main comparator interrupt is disabled (the CMP_INT flag continues to assert). BACKLIGHT REGISTER DESCRIPTIONS Configuration Register (CFGR)—Register 0x04 Table 16. CFGR Bit Map Bit 7 Reserved Bit 6 SEL_AB Bit 5 CMP2_SEL Bit 4 Bit 3 BLV Bit 2 Bit 1 Law Bit 0 FOVR Table 17.
PAGE 31
ADP8860 Bit Name D5EN Bit No. 4 D4EN 3 D3EN 2 D2EN 1 D1EN 0 Description Diode 5 backlight sink enable. 1 = selects LED5 as an independent sink. 0 = connects LED5 sink to backlight enable (BL_EN). Diode 4 backlight sink enable. 1 = selects LED4 as independent sink. 0 = connects LED4 sink to backlight enable (BL_EN). Diode 3 backlight sink enable. 1 = selects LED3 as independent sink. 0 = connects LED3 sink to backlight enable (BL_EN). Diode 2 backlight sink enable.
PAGE 32
ADP8860 Backlight Fade (BLFR)—Register 0x08 Table 24. BLFR Backlight Fade Bit Map Bit 7 Bit 6 Bit 5 BL_FO Bit 4 Bit 3 Bit 2 Bit 1 BL_FI Bit 0 Table 25. Bit Descriptions for the BLFR Register Bit Name BL_FO Bit No. 7:4 BL_FI 3:0 1 Description Backlight fade out rate. If the fade out is disabled (BL_FO = 0000), the backlight changes instantly (within 100 ms). If the fade out rate is set, the backlight fades from its current value to the dim or the off value.
PAGE 33
ADP8860 Backlight Level 1 (Daylight) Maximum Current Register (BLMX1)—Register 0x09 Table 26. BLMX1 Bit Map Bit 7 Reserved Bit 6 Bit 5 Bit 4 Bit 3 BL1_MC Bit 2 Bit 1 Bit 0 Table 27. Bit Descriptions for the BLMX1 Register Bit Name N/A BL1_MC Bit No. 7 6:0 Description Reserved. Backlight maximum Level 1 (daylight) current.
PAGE 34
ADP8860 DAC Code 0x3E 0x3F 0x40 0x41 0x42 0x43 0x44 0x45 0x46 0x47 0x48 0x49 0x4A 0x4B 0x4C 0x4D 0x4E 0x4F 0x50 0x51 0x52 0x53 0x54 0x55 0x56 0x57 0x58 0x59 0x5A 0x5B 0x5C 0x5D 0x5E Linear Law (mA) 14.646 14.882 15.118 15.354 15.591 15.827 16.063 16.299 16.535 16.772 17.008 17.244 17.480 17.717 17.953 18.189 18.425 18.661 18.898 19.134 19.370 19.606 19.842 20.079 20.315 20.551 20.787 21.024 21.260 21.496 21.732 21.968 22.205 Square Law 1 (mA) 7.150 7.382 7.619 7.859 8.102 8.350 8.601 8.855 9.114 9.376 9.
PAGE 35
ADP8860 Backlight Level 1 (Daylight) Dim Current Register (BLDM1)—Register 0x0A Table 29. BLDM1 Bit Map Bit 7 Reserved Bit 6 Bit 5 Bit 4 Bit 3 BL1_DC Bit 2 Bit 1 Bit 0 Table 30. Bit Descriptions for the BLDM1 Register Bit Name N/A BL1_DC Bit No. 7 6:0 Description Reserved. Backlight Level 1 (daylight) dim current. The backlight is set to the dim current value after a dim timeout or if the DIM_EN flag is set by the user (see Table 28 for a complete list of values).
PAGE 36
ADP8860 Backlight Level 2 (Office) Dim Current Register (BLDM2)—Register 0x0C Table 33. BLDM2 Bit Map Bit 7 Reserved Bit 6 Bit 5 Bit 4 Bit 3 BL2_DC Bit 2 Bit 1 Bit 0 Table 34. Bit Descriptions for the BLDM2 Register Bit Name N/A BL2_DC Bit No. 7 6:0 Description Reserved. Backlight Level 2 (office) dim current. See Table 28 for a complete list of values. The backlight is set to the dim current value after a dim timeout or if the DIM_EN flag is set by the user.
PAGE 37
ADP8860 Backlight Level 3 (Dark) Dim Current Register (BLDM3)—Register 0x0E Table 37. BLDM3 Bit Map Bit 7 Reserved Bit 6 Bit 5 Bit 4 Bit 3 BL3_DC Bit 2 Bit 1 Bit 0 Table 38. Bit Descriptions for the BLDM3 Register Bit Name N/A BL3_DC Bit No. 7 6:0 Description Reserved. Backlight Level 3 (dark) dim current. See Table 28 for a complete list of values. The backlight is set to the dim current value after a dim timeout or if the DIM_EN flag is set by the user.
PAGE 38
ADP8860 Bit Name SC4_EN Bit No. 3 Description This enable acts upon the LED4. 1 = SC4 is turned on. 0 = SC4 is turned off. SC3_EN 2 SC2_EN 1 SC1_EN 0 This enable acts upon the LED3. 1 = SC3 is turned on. 0 = SC3 is turned off. This enable acts upon the LED2. 1 = SC2 is turned on. 0 = SC2 is turned off. This enable acts upon the LED1. 1 = SC1 is turned on. 0 = SC1 is turned off. Independent Sink Current Time (ISCT1)—Register 0x11 Table 43.
PAGE 39
ADP8860 Independent Sink Current Time (ISCT2)—Register 0x12 Table 45. ISCT2 Bit Map Bit 7 Bit 6 SC4OFF Bit 5 Bit 4 SC3OFF Bit 3 Bit 2 SC2OFF Bit 1 Bit 0 SC1OFF Table 46. Bit Descriptions for the ISCT2 Register Designation SC4OFF Bit 7:6 SC3OFF 5:4 SC2OFF 3:2 SC1OFF 1:0 1 2 Description 1, 2 SC4 off time. When the SC off time is disabled, the ISC remains on while enabled.
PAGE 40
ADP8860 Independent Sink Current Fade (ISCF)—Register 0x13 Table 47. ISCF Bit Map Bit 7 Bit 6 Bit 5 SCFO Bit 4 Bit 3 Bit 2 Bit 1 SCFI Bit 0 Table 48. Bit Descriptions for the ISCF Register Bit Name SCFO Bit No. 7:4 SCFI 3:0 Description Sink current fade out rate. The following times listed are for a full-scale fade out (30 mA to 0 mA). Fades between closer current values reduce the fade time. See the Automated Fade In and Fade Out section for more information. 0000 = disabled. 0001 = 0.30 sec.
PAGE 41
ADP8860 Sink Current Register LED7 (ISC7)—Register 0x14 Table 49. ISC7 Bit Map Bit 7 SCR Bit 6 Bit 5 Bit 4 Bit 3 SCD7 Bit 2 Bit 1 Bit 0 Table 50. Bit Descriptions for the ISC7 Register Bit Name SCR Bit No. 7 SCD7 6:0 Description 1 = Sink Current 1. 0 = Sink Current 0. For the lowest input current consumption and optimal efficiency, set SCR to 0 when D7 is set to ISC in Register 0x05 and SC7_EN = 0.
PAGE 42
ADP8860 DAC Code 0x28 0x29 0x2A 0x2B 0x2C 0x2D 0x2E 0x2F 0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3A 0x3B 0x3C 0x3D 0x3E 0x3F 0x40 0x41 0x42 0x43 0x44 0x45 0x46 0x47 0x48 0x49 0x4A 0x4B 0x4C 0x4D 0x4E 0x4F 0x50 0x51 0x52 0x53 Linear Law (mA) 18.90 19.37 19.84 20.31 20.79 21.26 21.73 22.20 22.68 23.15 23.62 24.09 24.57 25.04 25.51 25.98 26.46 26.93 27.40 27.87 28.35 28.82 29.29 29.76 30.24 30.71 31.18 31.65 32.13 32.60 33.07 33.54 34.02 34.49 34.96 35.43 35.91 36.38 36.85 37.32 37.80 38.27 38.
PAGE 43
ADP8860 Sink Current Register LED6 (ISC6)—Register 0x15 Table 52. ISC6 Bit Map Bit 7 Reserved Bit 6 Bit 5 Bit 4 Bit 3 SCD6 Bit 2 Bit 1 Bit 0 Table 53. Bit Descriptions for the ISC6 Register Bit Name N/A SCD6 Bit No. 7 6:0 Description Reserved. Sink current. Use the following DAC code schedule (see Table 28 for a complete list of values): DAC 0000000 0000001 0000010 0000011 … 1111111 Linear Law (mA) 0 0.236 0.472 0.709 … 30 Square Law (mA) 0 0.002 0.007 0.
PAGE 44
ADP8860 Sink Current Register LED3 (ISC3)—Register 0x18 Table 58. ISC3 Bit Map Bit 7 Reserved Bit 6 Bit 5 Bit 4 Bit 3 SCD3 Bit 2 Bit 1 Bit 0 Table 59. Bit Descriptions for the ISC3 Register Bit Name N/A SCD3 Bit No. 7 6:0 Description Reserved. Sink current. Use the following DAC code schedule (see Table 28 for a complete list of values): DAC 0000000 0000001 0000010 0000011 … 1111111 Linear Law (mA) 0 0.236 0.472 0.709 … 30 Square Law (mA) 0 0.002 0.007 0.
PAGE 45
ADP8860 COMPARATOR REGISTER DESCRIPTIONS Comparator Configuration (CCFG)—Register 0x1B Table 64. CCFG Bit Map Bit 7 Bit 6 FILT Bit 5 Bit 4 FORCE_RD Bit 3 L3_OUT Bit 2 L2_OUT Bit 1 L3_EN Bit 0 L2_EN Table 65. Bit Descriptions for the CCFG Register Bit Name FILT Bit No. 7:5 Description Filter setting for the CMP_IN light sensor. 000 = 80 ms. 001 = 160 ms. 010 = 320 ms. 011 = 640 ms. 100 = 1280 ms. 101 = 2560 ms. 110 = 5120 ms. 111= 10,240 ms.
PAGE 46
ADP8860 Bit Name L2_EN2 Bit No. 0 Description Note that the L3 comparator has priority over L2. 1 = the L2 comparator is enabled for the CMP_IN2 comparator. 0 = the L2 comparator is disabled for the CMP_IN2 comparator. Comparator Level 2 Threshold (L2_TRP)—Register 0x1D Table 68. L2_TRP Bit Map Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 L2_TRP Bit 2 Bit 1 Bit 0 Table 69. Bit Descriptions for the L2_TRP Register Bit Name L2_TRP Bit No. 7:0 Description Comparator Level 2 threshold.
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ADP8860 Comparator Level 3 Threshold (L3_TRP)—Register 0x1F Table 72. L3_TRP Bit Map Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 L3_TRP Bit 2 Bit 1 Bit 0 Table 73. Bit Descriptions for the L3_TRP Register Bit Name L3_TRP Bit No. 7:0 Description Comparator Level 3 threshold. If the comparator input is below L3_TRP, the comparator trips and the backlight enters Level 3 (dark) mode. The following lists the code settings for photosensor current: 0000000 = 0 μA. 0000001 = 0.54 μA. 0000010 = 1.08 μA. 0000011 = 1.
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ADP8860 First Phototransistor Register: High Byte (PH1LEVH)—Register 0x22 Table 78. PH1LEVH Bit Map Bit 7 Bit 6 Reserved Bit 5 Bit 4 Bit 3 Bit 2 PH1LEV_HIGH Bit 1 Bit 0 Table 79. Bit Descriptions for the PH1LEVH Register Bit Name N/A PH1LEV_HIGH Bit No. 7:5 4:0 Description Reserved. 13-bit conversion value for the first light sensor—high byte (Bit 12 to Bit 8). The value is updated every 80 ms (when the light sensor is enabled). This is a read-only register.
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ADP8860 OUTLINE DIMENSIONS 0.645 0.600 0.555 1.995 1.955 1.915 3 4 SEATING PLANE 2 1 A BALL A1 IDENTIFIER B 2.395 2.355 2.315 1.60 REF 0.287 0.267 0.247 C D E 0.40 REF BOTTOM VIEW 0.05 MAX COPLANARITY 0.415 0.400 0.385 (BALL SIDE UP) 0.230 0.200 0.170 021009-A TOP VIEW (BALL SIDE DOWN) Figure 47. 20-Ball Wafer Level Chip Scale Package [WLCSP] (CB-20-6) Dimensions shown in millimeters 0.60 MAX 4.00 BSC SQ 0.60 MAX 15 PIN 1 INDICATOR 20 16 1 PIN 1 INDICATOR 3.75 BSC SQ 0.
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ADP8860 ORDERING GUIDE Model ADP8860ACBZ-R7 1 ADP8860ACPZ-R71 Package Description 20-Ball WLCSP, Tape and Reel 20-Lead LFCSP_VQ, Tape and Reel Z = RoHS Compliant Part. 07967-033 Figure 49. Tape and Reel Orientation for WLCSP Units 07967-034 1 Temperature Range −40°C to +85°C −40°C to +85°C Figure 50. Tape and Reel Orientation for LFCSP Units Rev.
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ADP8860 NOTES Rev.