TCA8418E_15 Datasheet, PDF (6/50 Pages) Texas Instruments – I2C Controlled Keypad Scan IC With Integrated ESD Protection

TCA8418E
SCPS222C – MAY 2010 – REVISED OCTOBER 2015
www.ti.com
Electrical Characteristics (continued)
over recommended operating free-air temperature range, V_CC = 1.65 V to 3.6 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V_CC
MIN
f_SCL = 0 kHz
Oscillator
OFF
Oscillator
ON
1.65 V to 3.6 V
I_CC
Supply
Voltage
V_I on SDA,
ROW0–7,
COL0–9 = V_CC or
GND,
I_O = 0, I/O =
inputs,
f_SCL = 400 kHz
f_SCL = 1 MHz
f_SCL = 400 kHz
f_SCL = 1 MHz
1 key press
GPI low
(pullup
enable) ⁽¹⁾
1.65 V
3.6 V
1.65 V
3.6 V
f_SCL = 400 kHz
f_SCL = 1 MHz
GPI low
(pullup
disable)
1.65 V to 3.6 V
C_I
SCL
SDA
C_io
ROW0–7, COL0–9
V_I = V_CC or GND
f_SCL = 400 kHz
f_SCL = 1 MHz
V_IO = V_CC or GND
1 GPO
active
1.65 V to 3.6 V
1.65 V to 3.6 V
TYP MAX
13
18
15
30
15
40
115
125
25
35
115
125
6
8
10 12.5
5
6
UNIT
μA
pF
pF
(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)
f_scl
I²C clock frequency
t_sch
I²C clock high time
t_scl
I²C clock low time
t_sp
I²C spike time
t_sds
I²C serial data setup time
t_sdh
I²C serial data hold time
t_icr
I²C input rise time
t_icf
I²C input fall time
t_ocf
I²C output fall time; 10 pF to 400 pF bus
t_buf
I²C bus free time between Stop and
Start
t_sts
I²C Start or repeater Start condition
setup time
t_sth
I²C Start or repeater Start condition hold
time
t_sps
I²C Stop condition setup time
t_vd(data)
Valid data time; SCL low to SDA output
valid
STANDARD MODE
I²C BUS
FAST MODE
I²C BUS
MIN
MAX
MIN
MAX
0
100
0
400
4
0.6
4.7
1.3
50
50
250
100
0
0
1000 20 + 0.1C_b ⁽¹⁾
300
300 20 + 0.1C_b(1)
300
300 20 + 0.1C_b ⁽¹⁾
300
FAST MODE PLUS (FM+)
I²C BUS
MIN
MAX
0
1000
0.26
0.5
50
50
0
120
120
120
UNIT
kHz
μs
μs
ns
ns
ns
ns
ns
μs
4.7
1.3
0.5
μs
4.7
0.6
0.26
μs
4
4
1
0.6
0.6
0.9
0.26
μs
0.26
μs
0.45 μs
t_vd(ack)
Valid data time of ACK condition; ACK
signal from SCL low to SDA (out) low
1
0.9
0.45 μs
(1) C_b = total capacitance of one bus line in pF
6
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