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TCA8418E

www.ti.com

SCPS222B –MAY 2010–REVISED SEPTEMBER 2010

C CONTROLLED KEYPAD SCAN IC WITH INTEGRATED ESD PROTECTION

Check for Samples: TCA8418E

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 non-GPIO

The TCA8418E is a keypad scan device with

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

• ±15kV Human Body Model High Voltage ESD

(SDA)].

(GPIO lines)

The key controller includes an oscillator that

• Low Standby (Idle) Current Consumption: 3 mA

debounces at 50 ms and maintains a 10 byte FIFO of

• Polling Current Drain 70 mA for One Key

key-press and release events which can store up to

10 keys with overflow wrap capability. An interrupt

Pressed

(INT) output can be configured to alert key presses

• 10 Byte FIFO to Store 10 Key Presses and

and releases either as they occur, or at maximum

Releases

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

• Supports 1-MHz Fast Mode Plus I

C Bus

included to indicate the detection of CTRL-ALT-DEL

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

• Open-Drain Active-Low Interrupt Output,

Asserted when Key is Pressed and Key is

The major benefit of this device is it frees up the

Released

processor from having to scan the keypad for presses

and releases. This provides power and bandwidth

• Minimum Debounce Time of 50 ms

savings. The TCA8418E is also ideal for usage with

• Schmitt-Trigger Action Allows Slow Input

processors that have limited GPIOs.

Transition and Better Switching Noise

Immunity at the SCL and SDA Inputs: Typical

hys

at 1.8 V is 0.18 V

• Latch-Up Performance Exceeds 200 mA Per

JESD 78, Class II

• Very Small Package

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

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 (35 pages)

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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 2 I C CONTROLLED KEYPAD SCAN IC WITH INTEGRATED ESD PROTECTION Check for Samples: TCA8418E FEATURES APPLICATIONS • • • • • • 1 • • • • • • • • • • • • • Operating Power-Supply Voltage Range of 1.65 V to 3.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com ORDERING INFORMATION (1) PACKAGE (2) TA –40°C to 85°C (1) (2) WCSP – YFP ORDERABLE PART NUMBER Tape and reel TCA8418EYFPR TOP-SIDE MARKING 592 For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 TERMINAL FUNCTIONS TERMINAL NO.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) VCC VI VO MIN MAX Supply voltage range –0.5 4.6 V (2) V Input voltage range –0.5 4.6 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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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 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 3.6 V IOH = –1 mA IOH = –8 mA VOH ROW0–7, COL0–9 high-level output voltage TYP MAX V 1 1.65 V 1.25 1.65 V 1.2 2.3 V 1.8 1.4 3V 2.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 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 FAST MODE I2C BUS MIN MAX 100 FAST MODE PLUS (FM+) I2C BUS MIN MAX 0 400 MIN MAX 0 1000 UNIT fscl I2C clock frequency 0 tsch I2C clock high time 4 0.6 0.26 ms tscl I2C clock low time 4.7 1.3 0.
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TCA8418E www.ti.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com At power on, the GPIOs (ROW0–7 and COL0–9) are configured as inputs with internal 50-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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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 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 2 specifies the performance of the power-on reset feature for TCA8418E for both types of power-on reset. Table 2.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 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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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 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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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 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 TCA8418E is shown in Table 3.
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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 Table 3. BIT BYTE 7 (MSB) 6 5 4 3 2 1 0 (LSB) 0 1 1 0 1 0 0 R/W 2 I C 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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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com Table 4.
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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 Table 4.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 BIT NAME 0 KE_IEN www.ti.com DESCRIPTION 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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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 BIT NAME 2 KEC2 Key event count, Bit 2 DESCRIPTION 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. As interrupts happen (press or release), the count increases accordingly.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 ADDRESS REGISTER NAME (1) 0×10 Unlock2 www.ti.com BIT REGISTER DESCRIPTION Unlock key 2 7 6 5 4 3 2 1 0 UK2_ 7 UK2_ 6 UK2 _5 UK2_ 4 UK2_ 3 UK2 _2 UK2_ 1 UK2 _0 UK1[6:0] contains the key number used to unlock key 1 UK2[6:0] contains the key number used to unlock key 2 A ‘0’ in either register means it is disabled. It lasts up to 7 seconds.
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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 DEBOUNCE ENABLED 50 ms GPI with INTE 50 ms INT VALID HIGH TRIGGER INTERRUPT VALID LOW TRIGGER INTERRUPT DEBOUNCE ENABLED GPI with INTE INT VALID HIGH TRIGGER INTERRUPT VALID LOW TRIGGER INTERRUPT Debounce disable will have the same effect for GPI mode or for rows in keypad scanning mode. The reset line always has a 50-ms debounce time. The debounce time for inputs is the time required for the input to be stable to be noticed.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com Figure 8. Typical Application Table 5.
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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 Ghosting Supports multiple key presses accurately. Applications requiring three-key combinations (such as ) must ensure that the three keys are wired in appropriate key positions to avoid ghosting (or appearing like a 4th key has been pressed) GPI Events A column or row configured as GPI can be programmed to be part of the Key Event Table, hence becomes also capable of generating Key Event Interrupt.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com Reads The bus master first must send the TCA8418E address with the LSB set to a logic 0. The command byte is sent after the address and determines which register is accessed. After a restart, the device address is sent again but, this time, the LSB is set to a logic 1. Data from the register defined by the command byte then is sent by the TCA8418E (see Figure 11 and Figure 12).
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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 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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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com 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 0.
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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 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 60 Source Current, I Output Low Voltage, V OL (mV) TA = -40°C 90 V CC = 3.3 V, IOL = 10 m A 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 0.3 0.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com 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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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 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 tsp ticf tbuf tvd tocf tvd tsts tsps SDA 0.7 ´ VCCI 0.
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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com 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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TCA8418E www.ti.com SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 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 P3 0.7 ´ VCCP 0.3 ´ VCCI Slave ACK SDA tpv (see Note B) Pn Unstable Data Last Stable Bit WRITE MODE (R/W = 0) SCL 0.7 ´ VCCI 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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TCA8418E SCPS222B – MAY 2010 – REVISED SEPTEMBER 2010 www.ti.com 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.com 20-May-2013 PACKAGING INFORMATION Orderable Device Status (1) TCA8418EYFPR ACTIVE Package Type Package Pins Package Drawing Qty DSBGA YFP 25 3000 Eco Plan Lead/Ball Finish (2) Green (RoHS & no Sb/Br) MSL Peak Temp Op Temp (°C) Device Marking (3) SNAGCU Level-1-260C-UNLIM (4/5) -40 to 85 592 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
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PACKAGE MATERIALS INFORMATION www.ti.com 1-Oct-2010 TAPE AND REEL INFORMATION *All dimensions are nominal Device TCA8418EYFPR Package Package Pins Type Drawing SPQ DSBGA 3000 YFP 25 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 180.0 8.4 Pack Materials-Page 1 2.07 B0 (mm) K0 (mm) P1 (mm) 2.07 0.65 4.0 W Pin1 (mm) Quadrant 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 1-Oct-2010 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TCA8418EYFPR DSBGA YFP 25 3000 220.0 220.0 34.
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D: Max = 1.99 mm, Min = 1.93 mm E: Max = 1.99 mm, Min = 1.
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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.