Datasheet

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Mobile I/O Expander and

QWERTY Keypad Controller

Data Sheet

ADP5588

FEATURES

18-GPIO port expander or 10 × 8 keypad matrix

GPIOs configurable to GPIs, GPOs, and keypad rows or

columns

Dual light sensor inputs (C8 and C9)

C interface

C register read autoincrement

1.8 V to 3.0 V operation

Keypad lock capability

Open-drain interrupt output

Key press and key release interrupts

GPI interrupt with level programmability

Programmable pull-ups

Key event counter with overflow interrupt

50 μs debounce on the reset line and GPIs

1 μA typical idle current, 55 μA typical polling current drain

for one key press

Small 4 mm × 4 mm LFCSP package

APPLICATIONS

Keypad and I/O expander designed for QWERTY type phones

that require a large keypad matrix

FUNCTIONAL BLOCK DIAGRAM

CONTROL

REGISTERS

CONTROL

INTERFACE

REF

VOLTAGE

REF

VOLTAGE

GND

SCL

SDA

RST

INT

3 4 5 6 7 8 9 10 11 12 13 14 15 161 2

07673-001

ADP5588

Figure 1.

GENERAL DESCRIPTION

The ADP5588 is an I/O port expander and keypad matrix

designed for QWERTY type phones that require a large keypad

matrix and expanded I/O lines. I/O expander ICs are used in

mobile platforms as a solution to the limited number of GPIOs

available in the main processor.

In its small 4 mm × 4 mm package, the ADP5588 contains

enough power to handle all key scanning and decoding and flag

the processor of key presses and releases via the I

C® interface

and interrupt. It frees the main microprocessor from having to

monitor the keypad, thereby minimizing current drain and

increasing processor bandwidth. It is also equipped with a

buffer/FIFO and key event counter to handle and keep track of

up to 10 unprocessed key or GPI events with overflow wrap and

interrupt capability.

The ADP5588 has a keylock capability with an option to trigger

or not trigger an interrupt at key presses and releases. All com-

munication to the main processor is done using one interrupt line

and two I

C-compatible interface lines. The ADP5588 can be

configured to have a keypad matrix of up to 8 rows × 10 columns

(a maximum of 80 keys).

When used for smaller keypad matrices, unused row and

column pins can be reconfigured to act as general-purpose

inputs, outputs, or light sensor inputs. R0, R1, R2, R3, R4, R5,

R6, and R7 denote the row pins of the matrix, while C0, C1, C2,

C3, C4, C5, C6, C7, C8, and C9 denote the column pins. At

power-up, all rows and columns default as GPIs and must be

programmed to function as part of the keypad matrix, GPOs, or

light sensor inputs. In addition to keypad and GPIO functionalities,

C8 and C9 can also be configured as light sensor inputs.

When configured as keypad lines, the function of the C8 and

C9 lines is straightforward: the control interface disconnects

these lines from the comparator inputs, disables the light sensor

comparator, and connects them to the keypad columns of the

keypad matrix. When used as light sensor comparator inputs,

the control interface disconnects these pins from the keypad,

enables the comparators, and connects these lines to the com-

parator inputs. Two external capacitors (0.1 μF) are required

when these pins are configured as light sensor inputs. When

used as GPIOs, these pins are removed from the keypad and the

light sensor interface, and the light sensor comparators are

disabled, along with the logic for the sensors.

Rev. C

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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

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Summary of content (28 pages)

PAGE 1
FEATURES FUNCTIONAL BLOCK DIAGRAM ADP5588 REF VOLTAGE GND 19 VCC 21 SCL 23 SDA 22 CONTROL REGISTERS RST 20 CONTROL INTERFACE C9 C9 C8 C8 C9 18 REF VOLTAGE C8 17 R3 R2 R1 10 11 12 13 14 15 16 07673-001 R4 9 C7 R5 8 C6 7 C5 6 C4 5 C3 4 C2 3 C1 2 C0 1 R6 INT 24 R7 18-GPIO port expander or 10 × 8 keypad matrix GPIOs configurable to GPIs, GPOs, and keypad rows or columns Dual light sensor inputs (C8 and C9) I2C interface I2C register read autoincrement 1.8 V to 3.
PAGE 2
ADP5588 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Keypad Operation .........................................................................7 Applications ....................................................................................... 1 General-Purpose Inputs and Outputs ........................................9 Functional Block Diagram ..............................................................
PAGE 3
Data Sheet ADP5588 SPECIFICATIONS TA = TJ = −40°C to +85°C, unless otherwise noted. DC ELECTRICAL CHARACTERISTICS Table 1.
PAGE 4
ADP5588 Data Sheet Table 3. Comparator Input Capacitor Parameter Comparator Input Capacitor Value Symbol CCOMP Min Typ 0.1 Max Unit μF Symbol CIN COUT CB2 Min Typ 1 Max 10 50 400 Unit pF pF pF Symbol RSTD TKUT TKIMT TD TTTR Min 60 Typ Max Unit μs sec sec μs sec Symbol fSCL tHIGH tLOW tSU, DAT tHD, DAT tSU, STA tHD, STA tBUF tSU, STO tR tF tSP Min Table 4.
PAGE 5
Data Sheet ADP5588 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 7. Parameter VCC R0 to R7, C0 to C9 SCL SDA RST INT GND Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range ESD Machine Model ESD Human Body Model ESD Charged Device Model Soldering Condition Rating −3 V to +4.0 V −3 V to VCC + 0.3 V −3 V to VCC+ 0.3 V −3 V to VCC + 0.3 V −3 V to VCC + 0.3 V −3 V to VCC + 0.3 V −0.3 V to +0.
PAGE 6
ADP5588 Data Sheet 24 23 22 21 20 19 INT SCL SDA VCC RST GND PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 1 2 3 4 5 6 PIN 1 INDICATOR ADP5588 TOP VIEW (Not to Scale) 18 17 16 15 14 13 CMP_IN2/C9 CMP_IN1/C8 C7 C6 C5 C4 NOTES 1. NC = NO CONNECT. 2. EXPOSED PAD MUST BE CONNECTED TO GROUND. 07673-003 R1 R0 C0 C1 C2 C3 7 8 9 10 11 12 R7 R6 R5 R4 R3 R2 Figure 3. Pin Configuration Table 9. Pin Function Descriptions Pin No.
PAGE 7
Data Sheet ADP5588 THEORY OF OPERATION CONTROL INTERFACE REF VOLTAGE 20 C9 C9 C8 C8 C9 0.1µF C8 17 0.
PAGE 8
ADP5588 Data Sheet The first read of any of the FIFO registers displays the first event that happened and its status. Subsequent reads of the same register replace the register data with the next event that happens. If tracking of all the events is important, it is best to used a single register per event. After all the events in the FIFO are read, reading of any of the event registers yields a zero value.
PAGE 9
Data Sheet ADP5588 Autoincrement The ADP5588 features automatic increment during I C read access. This allows the user to increment the address pointer without having to send a read command for subsequent addresses. This minimizes processor intervention and, therefore, saves processor bandwidth and current drain. Bit 7 of Register 0x01 must be set to initiate autoincrement (see Figure 16 for the full write and read sequence).
PAGE 10
ADP5588 Data Sheet is programmed as high, a high on that pin is considered active and meets the interrupt requirement. If the interrupt is programmed as low, a low on that pin is considered active and meets the interrupt requirement. GPI data and interrupt status are reflected in the GPIO interrupt and data status registers (Register 0x11 through Register 0x16). Caution must be taken during software implementation because an interrupt may be set immediately after register settings.
PAGE 11
Data Sheet ADP5588 START NO NO KEY PRESS DETECTED MASK TIMER = 0 YES YES KEY PRESS DETECTED NO YES GENERATE KE INTERRUPT FIRST UNLOCK KEY DETECTED START MASK TIMER NO YES YES MASK TIMER EXPIRES START UNLOCK1 TO UNLOCK2 NO NO UNLOCK1 TO UNLOCK2 TIMER EXPIRES FIRST UNLOCK KEY DETECTED YES NO YES START UNLOCK1 TO UNLOCK2 SECOND UNLOCK KEY DETECTED UNLOCK1 TO UNLOCK2 TIMER EXPIRES YES YES GENERATE KEYLOCK INTERRUPT NO YES NO MASK TIMER EXPIRES NO NO SECOND UNLOCK KEY DETECTED 0
PAGE 12
ADP5588 Data Sheet Each light sensor input has two built-in comparators (the L2 comparator and the L3 comparator) with two programmable trip points, L2 and L3. The trip points are used to select among three operation modes based on ambient lighting conditions: outdoor, office, and dark modes. L2 = 1 L2 = 1 L2 = 0 L3 = 1 L3 = 0 L3 = 0 1 kLUX 1000µA 0 LUX DARK OFFICE L3 OUTDOOR 07673-016 0µA L2 BRIGHTNESS Figure 11.
PAGE 13
Data Sheet ADP5588 Comparator Interrupt in Register 0x02. If the comparator interrupt enable bits are set, the interrupt pin is asserted every time the comparator interrupt bits are set. The comparator interrupt flag can be cleared only by writing a 1 to it. The ADP5588 allows the user to trigger an interrupt based on the light sensor comparator inputs.
PAGE 14
ADP5588 Data Sheet I2C PROGRAMMING AND DIGITAL CONTROL Figure 15 shows a typical read sequence for reading back an internal register. The cycle begins with a start condition followed by the chip write address (0x68). The ADP5588 acknowledges the chip write address byte by pulling the data line low. The address of the register from which data is to be read is sent next. The ADP5588 acknowledges the register address byte by pulling the data line low.
PAGE 15
Data Sheet ADP5588 REGISTERS The general behavior of registers is as follows: • • • • All registers are 0 on reset. All registers are read/write unless otherwise specified. Unused bits are read as 0. Interrupt bits are cleared by writing 1 to the flag; writing 0 or reading the flag has no effect, with the exception of the key press, key release, and GPIO interrupt status registers, which are cleared on a read. Table 17.
PAGE 16
ADP5588 Data Sheet Address 0x2E 0x2F 0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3A 0x3B 0x3C 0x3D 0x3E Register Name GPIO_PULL3 Not used CMP_CFG_STAT CMP_CONFG_SENS1 CMP_CONFG_SENS2 CMP1_LVL2_TRIP CMP1_LVL2_HYS CMP1_LVL3_TRIP CMP1_LVL3_HYS CMP2_LVL2_TRIP CMP2_LVL2_HYS CMP2_LVL3_TRIP CMP2_LVL3_HYS CMP1_ADC_DAT_R1 CMP1_ADC_DAT_R2 CMP2_ADC_DAT_R1 CMP2_ADC_DAT_R2 Description GPIO pull disable Not used Comparator configuration and status register Sensor 1 comparator configuration register Sensor 2 c
PAGE 17
Data Sheet ADP5588 Table 20. INT_STAT—Register 0x02 (Interrupt Status Register) Field CMP2_INT Bit 5 CMP1_INT 4 OVR_FLOW_INT 1 3 K_LCK_INT 2 2 GPI_INT1, 3 1 KE_INT1, 3 0 Description Comparator interrupt status. When set, write 1 to clear. 1: Comparator 2 interrupt is detected. 0: Comparator 2 interrupt is not detected. Comparator interrupt status. When set, write 1 to clear. 1: Comparator 1 interrupt is detected. 0: Comparator 1 interrupt is not detected. Overflow interrupt status.
PAGE 18
ADP5588 Data Sheet Register Name Register Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 KEY_EVENTI (Register 0x0C) Key Event Register B status (KE[6:0] = Key number), KP[7] = 0: released, 1: pressed (cleared on read) Key Event Register B status (KE[6:0] = Key number), KP[7] = 0: released, 1: pressed (cleared on read) KI7 KI6 KI5 KI4 KI3 KI2 KI1 KI0 KJ7 KJ6 KJ5 KJ4 KJ3 KJ2 KJ1 KJ0 KEY_EVENTJ (Register 0x0D) Data in key events is provided as a FIFO, where data is s
PAGE 19
Data Sheet ADP5588 Table 28. GPIO_DAT_OUTx—Register 0x17 to Register 0x19 (GPIO Data Out) Register Name GPIO_DAT_OUT1 (Register 0x17) GPIO_DAT_OUT2 (Register 0x18) GPIO_DAT_OUT3 (Register 0x19) Register Description GPIO data out (GPIO data to be written to GPIO out driver, inputs are not affected). This is needed so that the value can be written prior to being set as an output. GPIO data out (GPIO data to be written to GPIO out driver, inputs are not affected).
PAGE 20
ADP5588 Data Sheet Table 32. GPIO_DIRx—Register 0x23 to Register 0x25 (GPIO Data Direction) Register Name GPIO_DIR1 (Register 0x23) GPIO_DIR2 (Register 0x24) GPIO_DIR3 (Register 0x25) Register Description GPIO data direction 0: GPIO 1: Output GPIO data direction 0: GPIO 1: Output GPIO data direction 0: GPIO 1: Output Bit 7 R7D Bit 6 R6D Bit 5 R5D Bit 4 R4D Bit 3 R3D Bit 2 R2D Bit 1 R1D Bit 0 R0D C7D C6D C5D C4D C3D C2D C1D C0D N/A N/A N/A N/A N/A N/A C9D C8D Table 33.
PAGE 21
Data Sheet ADP5588 COMPARATOR REGISTER DESCRIPTIONS Table 37. CMP_CFG_STAT—Register 0x30 (Comparator Configuration and Status Register) Field CMP2_L3_OUT Bit 7 CMP2_L2_OUT 6 CMP1_L3_OUT 5 CMP1_L2_OUT 4 CMP2_IEN 3 CMP1_IEN 2 CMP2_EN 1 CMP1_EN 0 Description Sensor 2 Comparator L3 output. 0: Ambient light is greater than Level 3 (dark). 1: L3_CMP has detected a change in ambient light from Level 2 (office) to L3 (dark). Sensor 2 Comparator L2 output.
PAGE 22
ADP5588 Data Sheet Table 39. CMP_CONFG_SENS2—Register 0x32 (Sensor 2 Comparator Configuration Register) Field FILT (2-0) Bit [7:6] [5:3] FORCE_RD 2 L3_EN 1 L2_EN 0 1 Description Not used. Programs the number of consecutive measurements required to transition the L2 and L3 levels. FILT Number Required Approximate Time (sec) 000 1 0.08 001 2 0.16 010 4 0.32 011 8 0.64 100 16 1.28 101 32 2.56 110 64 5.12 111 128 10.
PAGE 23
Data Sheet ADP5588 Table 44. CMP2_LVL2_TRIP—Register 0x37 (L2 Light Sensor Reference Level (Output Falling for Sensor 2) Field L2_T7 to L2_T0 Bit [7:0] Description Sensor 2 comparator Level 2 (Office) reference. If the comparator input is below this trip point, the comparator trips and enters Level 2 (office) mode and L2_OUT is set. The programmable range is from 0 μA to 1000 μA (0 lux to 2550 lux) in steps of 4 μA. Table 45.
PAGE 24
ADP5588 Data Sheet APPLICATIONS INFORMATION CONTROL INTERFACE REF VOLTAGE 20 C9 C9 C8 C8 C9 0.1µF C8 17 0.
PAGE 25
Data Sheet ADP5588 KEYPAD MATRIX VCC LIGHT SENSORS I2C INT RST J0 A1 B1 C1 D1 E1 F1 G1 H1 I1 J1 A2 B2 C2 D2 E2 F2 G2 H2 I2 J2 A3 B3 C3 D3 E3 F3 G3 H3 I3 J3 A4 B4 C4 D4 E4 F4 G4 H4 I4 J4 A5 B5 C5 D5 E5 F5 G5 H5 I5 J5 A6 B6 C6 D6 E6 F6 G6 H6 I6 J6 A7 B7 C7 D7 E7 F7 G7 H7 I7 J7 ADP5588 BACKLIGHT ENABLE PWM BACKLIGHT DRIVER EXPANDED GPIOs BACKLIGHT Figure 18. Integration Block Diagram Rev.
PAGE 26
ADP5588 Data Sheet OUTLINE DIMENSIONS PIN 1 INDICATOR 4.10 4.00 SQ 3.90 0.30 0.25 0.20 0.50 BSC PIN 1 INDICATOR 24 19 18 1 EXPOSED PAD TOP VIEW 0.80 0.75 0.70 0.50 0.40 0.30 13 12 6 7 0.25 MIN BOTTOM VIEW 0.05 MAX 0.02 NOM COPLANARITY 0.08 SEATING PLANE 2.20 2.10 SQ 2.00 FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. COMPLIANT TO JEDEC STANDARDS MO-220-WGGD-8. 072809A 0.20 REF Figure 19.
PAGE 27
Data Sheet ADP5588 NOTES Rev.