SCPS222C May   2010  – October 2015 TCA8418E

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  I2C Interface Timing Requirements
    7. 6.7  Reset Timing Requirements for Standard Mode, Fast Mode, Fast Mode Plus (FM+) I2C Bus
    8. 6.8  Switching Characteristics for Standard Mode, Fast Mode, Fast Mode Plus (FM+) I2C Bus
    9. 6.9  Keypad Switching Characteristics for Standard Mode, Fast Mode, Fast Mode Plus (FM+) I2C Bus
    10. 6.10 Typical Characteristics
  7. Parameter Measurement Information
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Key Events
        1. 8.3.1.1 Key Event Table
        2. 8.3.1.2 General Purpose Input (GPI) Events
        3. 8.3.1.3 Key Event (FIFO) Reading
        4. 8.3.1.4 Key Event Overflow
      2. 8.3.2 Keypad Lock/Unlock
      3. 8.3.3 Keypad Lock Interrupt Mask Timer
      4. 8.3.4 Control-Alt-Delete Support
      5. 8.3.5 Interrupt Output
        1. 8.3.5.1 50-µs Interrupt Configuration
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-On Reset (POR)
      2. 8.4.2 Powered (Key Scan Mode)
        1. 8.4.2.1 Idle Key Scan Mode
        2. 8.4.2.2 Active Key Scan Mode
    5. 8.5 Programming
      1. 8.5.1 I2C Interface
      2. 8.5.2 Bus Transactions
        1. 8.5.2.1 Writes
        2. 8.5.2.2 Reads
    6. 8.6 Register Maps
      1. 8.6.1 Device Address
      2. 8.6.2 Control Register and Command Byte
        1. 8.6.2.1  Configuration Register (Address 0x01)
        2. 8.6.2.2  Interrupt Status Register, INT_STAT (Address 0x02)
        3. 8.6.2.3  Key Lock and Event Counter Register, KEY_LCK_EC (Address 0x03)
        4. 8.6.2.4  Key Event Registers (FIFO), KEY_EVENT_A-J (Address 0x04-0x0D)
        5. 8.6.2.5  Keypad Lock1 to Lock2 Timer Register, KP_LCK_TIMER (Address 0x0E)
        6. 8.6.2.6  Unlock1 and Unlock2 Registers, UNLOCK1/2 (Address 0x0F-0x10)
        7. 8.6.2.7  GPIO Interrupt Status Registers, GPIO_INT_STAT1-3 (Address 0x11-0x13)
        8. 8.6.2.8  GPIO Data Status Registers, GPIO_DAT_STAT1-3 (Address 0x14-0x16)
        9. 8.6.2.9  GPIO Data Out Registers, GPIO_DAT_OUT1-3 (Address 0x17-0x19)
        10. 8.6.2.10 GPIO Interrupt Enable Registers, GPIO_INT_EN1-3 (Address 0x1A-0x1C)
        11. 8.6.2.11 Keypad or GPIO Selection Registers, KP_GPIO1-3 (Address 0x1D-0x1F)
        12. 8.6.2.12 GPI Event Mode Registers, GPI_EM1-3 (Address 0x20-0x22)
        13. 8.6.2.13 GPIO Data Direction Registers, GPIO_DIR1-3 (Address 0x23-0x25)
        14. 8.6.2.14 GPIO Edge/Level Detect Registers, GPIO_INT_LVL1-3 (Address 0x26-0x28)
        15. 8.6.2.15 Debounce Disable Registers, DEBOUNCE_DIS1-3 (Address 0x29-0x2B)
        16. 8.6.2.16 GPIO Pullup Disable Register, GPIO_PULL1-3 (Address 0x2C-0x2E)
  9. Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Ghosting Considerations
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Designing the Hardware Layout
        2. 9.2.2.2 Configuring the Registers
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Community Resources
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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6 Specifications

6.1 Absolute Maximum Ratings(1)

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
VCC Supply voltage –0.5 4.6 V
VI Input voltage (2) –0.5 4.6 V
VO Voltage range applied to any output in the high-impedance or power-off state(2) –0.5 4.6 V
Output voltage in the high or low state(2) –0.5 4.6
IIK Input clamp current VI < 0 ±20 mA
IOK Output clamp current VO < 0 ±20 mA
IOL Continuous output Low current P port, SDA VO = 0 to VCC 50 mA
INT 25
IOH Continuous output High current P port VO = 0 to VCC 50
Tstg Storage temperature –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (Non-GPIO pins)(1) ±2000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1000
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (GPIO pins)(1) ±15000
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

MIN MAX UNIT
VCC Supply voltage 1.65 3.6 V
VIH High-level input voltage SCL, SDA, ROW0–7, COL0–9, RESET 0.7 × VCC 3.6 V
VIL Low-level input voltage SCL, SDA, ROW0–7, COL0–9, RESET –0.5 0.3 × VCC V
IOH High-level output current ROW0–7, COL0–9 10 mA
IOL Low-level output current ROW0–7, COL0–9 25 mA
TA Operating free-air temperature –40 85 °C

6.4 Thermal Information

over operating free-air temperature range (unless otherwise noted)
THERMAL METRIC(1) TCA8418E UNIT
YFP (DSBGA)
25 PINS
RθJA Junction-to-ambient thermal resistance 61.2 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 0.4 °C/W
RθJB Junction-to-board thermal resistance 10.6 °C/W
ψJT Junction-to-top characterization parameter 1.0 °C/W
ψJB Junction-to-board characterization parameter 10.6 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance N/A °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

over recommended operating free-air temperature range, VCC = 1.65 V to 3.6 V (unless otherwise noted)
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
VIK Input diode clamp voltage II = –18 mA 1.65 V to 3.6 V –1.2 V
VPORR Power-on reset voltage, VCC rising VI = VCCP or GND, IO = 0 1.65 V to 3.6 V 1.03 1.43 V
VPORF Power-on reset voltage, VCC falling 0.76 1.15
VOH ROW0–7, COL0–9 high-level output voltage IOH = –1 mA 1.65 V 1.25 V
IOH = –8 mA 1.65 V 1.2
2.3 V 1.8
3 V 2.6
IOH = –10 mA 1.65 V 1.1
2.3 V 1.7
3 V 2.5
VOL ROW0–7, COL0–9 low-level output voltage IOL = 1 mA 1.65 V 0.4 V
IOL = 8 mA 1.65 V 0.45
2.3 V 0.25
3 V 0.25
IOL = 10 mA 1.65 V 0.6
2.3 V 0.3
3 V 0.25
IOL SDA VOL = 0.4 V 1.65 V to 3.6 V 3 mA
INT and CAD_INT VOL = 0.4 V 1.65 V to 3.6 V 3
II SCL, SDA, ROW0–7, COL0–9, RESET VI = VCCI or GND 1.65 V to 3.6 V 1 μA
RINT Internal pullup resistor value ROW0–7, COL0–9 55
ICC Supply Voltage VI on SDA,
ROW0–7,
COL0–9 = VCC or GND,
IO = 0, I/O = inputs,
fSCL = 0 kHz Oscillator OFF 1.65 V to 3.6 V 13 μA
Oscillator ON 18
fSCL = 400 kHz 1 key press 1.65 V 15
3.6 V 30
fSCL = 1 MHz 1.65 V 15
3.6 V 40
fSCL = 400 kHz GPI low (pullup enable)(1) 1.65 V to 3.6 V 115
fSCL = 1 MHz 125
fSCL = 400 kHz GPI low (pullup disable) 25
fSCL = 1 MHz 35
fSCL = 400 kHz 1 GPO active 115
fSCL = 1 MHz 125
CI SCL VI = VCC or GND 1.65 V to 3.6 V 6 8 pF
Cio SDA VIO = VCC or GND 1.65 V to 3.6 V 10 12.5 pF
ROW0–7, COL0–9 5 6
(1) Assumes that one GPIO is enabled.

6.6 I2C Interface Timing Requirements

over recommended operating free-air temperature range (unless otherwise noted) (see Figure 16)
STANDARD MODE
I2C BUS
FAST MODE
I2C BUS
FAST MODE PLUS (FM+)
I2C BUS
UNIT
MIN MAX MIN MAX MIN MAX
fscl I2C clock frequency 0 100 0 400 0 1000 kHz
tsch I2C clock high time 4 0.6 0.26 μs
tscl I2C clock low time 4.7 1.3 0.5 μs
tsp I2C spike time 50 50 50 ns
tsds I2C serial data setup time 250 100 50 ns
tsdh I2C serial data hold time 0 0 0 ns
ticr I2C input rise time 1000 20 + 0.1Cb (1) 300 120 ns
ticf I2C input fall time 300 20 + 0.1Cb(1) 300 120 ns
tocf I2C output fall time; 10 pF to 400 pF bus 300 20 + 0.1Cb (1) 300 120 μs
tbuf I2C bus free time between Stop and Start 4.7 1.3 0.5 μs
tsts I2C Start or repeater Start condition setup time 4.7 0.6 0.26 μs
tsth I2C Start or repeater Start condition hold time 4 0.6 0.26 μs
tsps I2C Stop condition setup time 4 0.6 0.26 μs
tvd(data) Valid data time; SCL low to SDA output valid 1 0.9 0.45 μs
tvd(ack) Valid data time of ACK condition; ACK signal from SCL low to SDA (out) low 1 0.9 0.45 μs
(1) Cb = total capacitance of one bus line in pF

6.7 Reset Timing Requirements for Standard Mode, Fast Mode, Fast Mode Plus (FM+) I2C Bus

over recommended operating free-air temperature range (unless otherwise noted) (see Figure 19)
MIN MAX UNIT
tW Reset pulse duration 120(1) μs
tREC Reset recovery time 120(1) μs
tRESET Time to reset 120(1) μs
(1) The GPIO debounce circuit uses each GPIO input which passes through a two-stage register circuit. Both registers are clocked by the same clock signal, presumably free-running, with a nominal period of 50 μs. When an input changes state, the new state is clocked into the first stage on one clock transition. On the next same-direction transition, if the input state is still the same as the previously clocked state, the signal is clocked into the second stage, and then on to the remaining circuits. Since the inputs are asynchronous to the clock, it will take anywhere from zero to 50 μs after the input transition to clock the signal into the first stage. Therefore, the total debounce time may be as long as 100 μs. Finally, to account for a slow clock, the spec further guard-banded at 120 μs.

6.8 Switching Characteristics for Standard Mode, Fast Mode, Fast Mode Plus (FM+) I2C Bus

PARAMETER FROM TO MIN MAX UNIT
tIV Interrupt valid time Key event or Key unlock or Overflow ROW0–7,
COL0–9
INT 20 60 μs
GPI_INT with Debounce_DIS_Low 40 120
GPI_INT with Debounce_DIS_High 10 30
CAD_INT INT, CAD_INT 20 60
tIR Interrupt reset delay time SCL INT 200 ns
SCL CAD_INT
tPV Output data valid SCL ROW0–7,
COL0–9
400 ns
tPS Input data setup time P port SCL 0 ns
tPH Input data hold time P port SCL 300 ns

6.9 Keypad Switching Characteristics for Standard Mode, Fast Mode, Fast Mode Plus (FM+) I2C Bus

PARAMETER MIN MAX UNIT
Key press to detection delay 25 μs
Key release to detection delay 25 μs
Keypad unlock timer 7 s
Keypad interrupt mask timer 31 s
Debounce 60 ms

6.10 Typical Characteristics

TA = 25°C (unless otherwise noted)
TCA8418E g_icc_ta.gif Figure 1. Supply Current vs Temperature
TCA8418E g_icc_vcc.gif Figure 3. Supply Current vs Supply Voltage
TCA8418E g_io_snk_i_vol_18.gif Figure 5. I/O Sink Current vs Output Low Voltage
(VCC = 1.8 V)
TCA8418E g_io_snk_i_vol_33.gif Figure 7. I/O Sink Current vs Output Low Voltage
(VCC = 3.3 V)
TCA8418E g_io_vol_ta.gif Figure 9. I/O Low Voltage vs Temperature
TCA8418E g_io_src_i_voh_18.gif Figure 11. I/O Source Current vs Output High Voltage
(VCC = 1.8 V)
TCA8418E g_io_src_i_voh_33.gif Figure 13. I/O Source Current vs Output High Voltage
(VCC = 3.3 V)
TCA8418E g_io_vh_ta.gif Figure 15. I/O High Voltage vs Temperature
TCA8418E g_icc_stdby_ta.gif Figure 2. Standby Supply Current vs Temperature
TCA8418E g_io_snk_i_vol_165.gif Figure 4. I/O Sink Current vs Output Low Voltage
(VCC = 1.65 V)
TCA8418E g_io_snk_i_vol_25.gif Figure 6. I/O Sink Current vs Output Low Voltage
(VCC = 2.5 V)
TCA8418E g_io_snk_i_vol_36.gif Figure 8. I/O Sink Current vs Output Low Voltage
(VCC = 3.6 V)
TCA8418E g_io_src_i_voh_165.gif Figure 10. I/O Source Current vs Output High Voltage
(VCC = 1.65 V)
TCA8418E g_io_src_i_voh_25.gif Figure 12. I/O Source Current vs Output High Voltage
(VCC = 2.5 V)
TCA8418E g_io_src_i_voh_36.gif Figure 14. I/O Source Current vs Output High Voltage
(VCC = 3.6 V)