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TCA8418

www.ti.com

SCPS215B –SEPTEMBER 2009–REVISED MARCH 2010

C CONTROLLED KEYPAD SCAN IC WITH INTEGRATED ESD PROTECTION

Check for Samples: TCA8418

FEATURES

APPLICATIONS

• Smart Phones

• Operating Power-Supply Voltage Range of

1.65 V to 3.6 V

• PDAs

• GPS Devices

• Supports QWERTY Keypad Operation Plus

GPIO Expansion

• MP3 Players

• Digital Cameras

• 18 GPIOs Can Be Configured into Eight Inputs

and Ten Outputs to Support an 8 × 10 Keypad

DESCRIPTION/ORDERING INFORMATION

Array (80 Buttons)

• ESD Protection Exceeds JESD 22 on all 18

The TCA8418 is a keypad scan device with

GPIO Pins and non GPIO pins

integrated ESD protection. It can operate from 1.65 V

to 3.6 V and has 18 general purpose inputs/outputs

– 2000-V Human Body Model (A114-A)

(GPIO) that can be used to support up to 80 keys via

– 1000-V Charged Device Model (C101)

the I

C interface [serial clock (SCL), serial data

• Low Standby (Idle) Current Consumption: 3 mA

(SDA)].

• Polling Current Drain 70 mA for One Key

The key controller includes an oscillator that

Pressed

debounces at 50 ms and maintains a 10 byte FIFO of

• 10 Byte FIFO to Store 10 Key Presses and

key-press and release events which can store up to

10 keys with overflow wrap capability. An interrupt

Releases

(INT) output can be configured to alert key presses

• Supports 1-MHz Fast Mode Plus I

C Bus

and releases either as they occur, or at maximum

• Open-Drain Active-Low Interrupt Output,

rate. Also, for the YFP package, a CAD_INT pin is

Asserted when Key is Pressed and Key is

included to indicate the detection of CTRL-ALT-DEL

Released

(i.e., 1, 11, 21) key press action.

• Minimum Debounce Time of 50 ms

The major benefit of this device is it frees up the

• Schmitt-Trigger Action Allows Slow Input

processor from having to scan the keypad for presses

and releases. This provides power and bandwidth

Transition and Better Switching Noise

savings. The TCA8418 is also ideal for usage with

Immunity at the SCL and SDA Inputs: Typical

processors that have limited GPIOs.

hys

at 1.8 V is 0.18 V

• Latch-Up Performance Exceeds 200 mA Per

JESD 78, Class II

• Very Small Packages

– WCSP (YFP): 2 mm × 2 mm; 0.4 mm pitch

– QFN (RTW): 4 mm × 4 mm; 0.5 mm pitch

ORDERING INFORMATION

PACKAGE

(1) (2)

ORDERABLE PART NUMBER TOP-SIDE MARKING

QFN – RTW Tape and reel TCA8418RTWR PZ418

–40°C to 85°C

WCSP – YFP Tape and reel TCA8418YFPR PREVIEW

(1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (39 pages)

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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 2 I C CONTROLLED KEYPAD SCAN IC WITH INTEGRATED ESD PROTECTION Check for Samples: TCA8418 APPLICATIONS FEATURES 1 • • • • • • • • • • • • • • Smart Phones Operating Power-Supply Voltage Range of 1.65 V to 3.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com 19 GND 20 RESET 21 VCC 22 SDA 23 SCL 24 INT RTW PACKAGE (TOP VIEW) ROW5 3 16 COL7 ROW4 4 15 COL6 ROW3 5 14 COL5 ROW2 6 13 COL4 COL3 12 COL2 COL1 10 ROW1 11 17 COL8 9 2 COL0 ROW6 8 18 COL9 ROW0 1 7 ROW7 YFP PACKAGE E E D D C C B B A A 4 5 3 2 1 1 3 2 4 5 (Bump View) (Laser Marking View) Table 1.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 Table 2. TERMINAL FUNCTIONS TERMINAL NO.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) MIN MAX VCC Supply voltage range –0.5 4.6 V VI Input voltage range (2) –0.5 4.6 V Voltage range applied to any output in the high-impedance or power-off state (2) –0.5 4.6 Output voltage range in the high or low state (2) –0.5 4.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 ELECTRICAL CHARACTERISTICS over recommended operating free-air temperature range, VCC = 1.65 V to 3.6 V (unless otherwise noted) PARAMETER VIK Input diode clamp voltage VPOR Power-on reset voltage VCCP MIN II = –18 mA TEST CONDITIONS 1.65 V to 3.6 V –1.2 VI = VCCP or GND, IO = 0 1.65 V to 3.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com I2C INTERFACE TIMING REQUIREMENTS over recommended operating free-air temperature range (unless otherwise noted) (see Figure 13) STANDARD MODE I2C BUS I2C clock frequency fscl 2 tsch I C clock high time tscl I2C clock low time tsp I2C spike time 2 FAST MODE I2C BUS FAST MODE PLUS (FM+) I2C BUS MIN MAX MIN MAX MIN MAX 0 100 0 400 0 1000 4 0.6 0.26 4.7 1.3 0.
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TCA8418 www.ti.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com At power on, the GPIOs (ROW0–7 and COL0–9) are configured as inputs with internal 100-kΩ pullups enabled. However, the system master can enable the GPIOs to function as inputs, outputs or as part of the keypad matrix. GPIOs not used for keypad control can be used to support other control features in the application. ROW7–ROW0 are configured as inputs in GPIO mode with a push-pull structure, at power-on.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 VCC Ramp-Down Ramp-Up VCC_TRR_VPOR50 VIN drops below POR levels Time Time to Re-Ramp VCC_FT VCC_RT Figure 2. VCC is Lowered Below the POR Threshold, Then Ramped Back Up to VCC Table 3 specifies the performance of the power-on reset feature for TCA8418 for both types of power-on reset. Table 3. RECOMMENDED SUPPLY SEQUENCING AND RAMP RATES (1) PARAMETER MIN MAX UNIT 1 100 ms See Figure 1 0.01 100 ms See Figure 1 0.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com VCC VPOR VPORF Time POR Time Figure 4. VPOR For proper operation of the power-on reset feature, use as directed in the figures and table above. Interrupt Output An interrupt is generated by any rising or falling edge of the port inputs in the input mode. After time tiv, the signal INT is valid.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 I2C communication with this device is initiated by a master sending a Start condition, a high-to-low transition on the SDA input/output, while the SCL input is high (see Figure 5). After the Start condition, the device address byte is sent, most significant bit (MSB) first, including the data direction bit (R/W).
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com Data Output by Transmitter NACK Data Output by Receiver ACK SCL From Master 1 2 8 9 S Clock Pulse for Acknowledgment Start Condition Figure 7. Acknowledgment on the I2C Bus Device Address The address of the TCA8418 is shown in Table 4.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 Table 4. BIT BYTE 7 (MSB) 6 5 4 3 2 1 0 (LSB) 0 1 1 0 1 0 0 R/W I2C slave address The last bit of the slave address defines the operation (read or write) to be performed. A high (1) selects a read operation, while a low (0) selects a write operation.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com Table 5.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 Table 5.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 BIT www.ti.com NAME DESCRIPTION 1 GPI_IEN GPI interrupt enable to host processor 0 = disabled 1 = enabled Can be used to mask interrupts 0 KE_IEN Key events interrupt enable to host processor 0 = disabled 1 = enabled Can be used to mask interrupts Bit 7 in this register is used to determine the programming mode. If it is low, all data bytes are written to the registers defined command byte.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 BIT NAME DESCRIPTION 4 LCK1 Keypad lock status 0 = unlock (if LCK2 is 0 too) 1 = locked (if LCK2 is 1 too) 3 KEC3 Key event count, Bit 3 2 KEC2 Key event count, Bit 2 1 KEC1 Key event count, Bit 1 0 KEC0 Key event count, Bit 0 KEC[3:0]: indicates how many registers have values in it. For example, KS(0000) = 0 events, KS(0001) = 1 event and KS(1010) = 10 events.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com KL[2:0] are for the Lock1 to Lock2 timer KL[7:3] are for the interrupt mask timer The interrupt mask timer should be set for the time it takes for the LCD to dim or turn off.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 Debounce Disable Registers, DEBOUNCE_DIS1–3 (Address 0×29–0×2B) This is for pins configured as inputs. A bit value of ‘0’ in any of the unreserved bits disables the debounce while a bit value of ‘1’ enables the debounce.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com COL COL COL COL COL COL COL COL COL COL X0 X0 X0 X0 X0 X0 X0 X0 X0 X0 X1 X1 X1 X1 X1 X1 X1 X1 X1 X1 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X3 X3 X3 X3 X3 X3 X3 X3 X3 X3 X4 X4 X4 X4 X4 X4 X4 X4 X4 X4 X5 X5 X5 X5 X5 X5 X5 X5 X5 X5 X6 X6 X6 X6 X6 X6 X6 X6 X6 X6 X7 X7 X7 X7 X7 X7 X7 X7 X7 X7 ROW ROW ROW ROW ROW ROW ROW ROW Figure 8. Typical Application Table 6.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 After receiving an interrupt, the host processor will first read the Interrupt Status register to determine what interrupt caused the processor interrupt. It will then read the Key Event Register to see what keys where pressed/released (Bits will then automatically clear on read in those registers). The processor will then write a 1 to the interrupt bit in the interrupt register to clear it and release the host interrupt to the processor.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 SCL 1 2 3 4 5 6 7 8 www.ti.com 9 Command Byte Slave Address S SDA 0 1 0 0 0 AD 0 DR 0 A 0 0 0 0 0 0 Data to Port 0 1 R/W Acknowledge From Slave Start Condition 0.0 A Data 1 A Acknowledge From Slave P Acknowledge From Slave Write to Port Data Out from Port Data Valid tpv Figure 9.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 SCL 1 2 3 4 5 6 7 8 9 Data from Port SDA S 0 1 0 0 0 0 AD DR Data 1 1 A R/W Acknowledge From Slave 1 Data from Port A Data 4 Acknowledge From Master A P Acknowledge From Master Read From Port Data Into Port INT tiv tir Figure 12.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com TYPICAL CHARACTERISTICS TA = 25°C (unless otherwise noted) SUPPLY CURRENT vs TEMPERATURE STANDBY SUPPLY CURRENT vs TEMPERATURE 12 1600 11 1400 10 V CC = 3.6 V 8 1200 Supply Current, I CC (nA) Supply Current, I CC (µA) 9 V CC = 3.3 V 7 6 V CC = 2.5 V 5 4 V CC = 1.8 V 3 2 1000 800 V CC = 3.6 V V CC = 3.3 V V CC = 2.5 V 600 V CC = 1.8 V 400 V CC = 1.65 V V CC = 1.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 TYPICAL CHARACTERISTICS (continued) TA = 25°C (unless otherwise noted) I/O SINK CURRENT vs OUTPUT LOW VOLTAGE I/O SINK CURRENT vs OUTPUT LOW VOLTAGE 100 70 V CC = 1.8 V V CC = 2.5 V 60 TA = -40°C TA = -40°C TA = 25°C (mA) 50 SINK TA = 85°C 40 Sink Current, I Sink Current, I SINK (mA) 80 TA = 25°C 30 20 TA = 85°C 60 40 20 10 0 0 0.0 0.1 0.2 0.3 0.4 0.5 0.0 0.6 0.1 I/O SINK CURRENT vs OUTPUT LOW VOLTAGE 0.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) TA = 25°C (unless otherwise noted) I/O LOW VOLTAGE vs TEMPERATURE I/O SOURCE CURRENT vs OUTPUT HIGH VOLTAGE 20 120 V CC = 1.65 V (-mA) 15 TA = 25°C SOURCE V CC = 1.8 V, IOL = 10 m A Source Current, I Output Low Voltage, V OL (mV) TA = -40°C 90 V CC = 3.3 V, IOL = 10 m A 60 30 V CC = 1.8 V, IOL = 1 m A 0 -40 TA = 85°C 10 5 V CC = 3.3 V, IOL = 1 m A 0 -15 10 35 60 0.0 85 0.1 0.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 TYPICAL CHARACTERISTICS (continued) TA = 25°C (unless otherwise noted) I/O SOURCE CURRENT vs OUTPUT HIGH VOLTAGE I/O SOURCE CURRENT vs OUTPUT HIGH VOLTAGE 44 44 V CC = 3.6 V V CC = 3.3 V TA = -40°C (-mA) TA = 85°C Source Current, I Source Current, I 33 TA = 25°C SOURCE TA = 25°C SOURCE (-mA) TA = -40°C 33 22 11 TA = 85°C 22 11 0 0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.0 0.1 0.2 0.3 0.4 0.5 0.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com PARAMETER MEASUREMENT INFORMATION VCCI RL = 1 kW SDA DUT CL = 50 pF (see Note A) SDA LOAD CONFIGURATION Two Bytes for READ Input Port Register (see Figure 9) Address Bit 7 (MSB) Stop Start Condition Condition (P) (S) tscl Address Bit 1 R/W Bit 0 (LSB) Data Bit 7 (MSB) ACK (A) Data Bit 0 (LSB) Stop Condition (P) tsch 0.7 ´ VCCI SCL 0.3 ´ VCCI ticr ticf tbuf tvd tsp tvd tocf tsts tsps SDA 0.7 ´ VCCI 0.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 PARAMETER MEASUREMENT INFORMATION (continued) VCCI RL = 4.7 kW INT DUT CL = 100 pF (see Note A) INTERRUPT LOAD CONFIGURATION ACK From Slave Start Condition 8 Bits (One Data Byte) From Port R/W Slave Address S 0 1 0 0 0 0 AD DR 1 A 1 2 3 4 5 6 7 8 A Data 1 ACK From Slave Data From Port A Data 2 1 P A tir tir B B INT tiv A tsps A Data Into Port Address Data 1 0.5 ´ VCCI INT SCL Data 2 0.
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TCA8418 SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 www.ti.com PARAMETER MEASUREMENT INFORMATION (continued) 500 W Pn DUT 2 ´ VCCP CL = 50 pF (see Note A) 500 W P-PORT LOAD CONFIGURATION SCL P0 A 0.7 ´ VCCP P3 0.3 ´ VCCI Slave ACK SDA tpv (see Note B) Pn Unstable Data Last Stable Bit WRITE MODE (R/W = 0) 0.7 ´ VCCI SCL P0 A tps P3 0.3 ´ VCCI tph Pn 0.5 ´ VCCP READ MODE (R/W = 1) A. CL includes probe and jig capacitance. B. tpv is measured from 0.
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TCA8418 www.ti.com SCPS215B – SEPTEMBER 2009 – REVISED MARCH 2010 PARAMETER MEASUREMENT INFORMATION (continued) VCCI RL = 1 kW 500 W Pn SDA DUT DUT CL = 50 pF (see Note A) SDA LOAD CONFIGURATION 2 ´ VCCP CL = 50 pF (see Note A) 500 W P-PORT LOAD CONFIGURATION Start SCL ACK or Read Cycle SDA 0.3 ´ VCCI tRESET VCCP/2 RESET tREC tREC tW VCCP/2 Pn tRESET A. CL includes probe and jig capacitance. B.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 28-Aug-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) TCA8418EYFPR DSBGA YFP 25 3000 180.0 8.4 TCA8418RTWR WQFN RTW 24 3000 330.0 12.4 Pack Materials-Page 1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 2.07 2.07 0.65 4.0 8.0 Q1 4.25 4.25 1.15 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 28-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TCA8418EYFPR TCA8418RTWR DSBGA YFP 25 3000 220.0 220.0 34.0 WQFN RTW 24 3000 367.0 367.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.