TCA8418 Datasheet, PDF (28/37 Pages) Texas Instruments – I2C CONTROLLED KEYPAD SCAN IC WITH INTEGRATED ESD PROTECTION

TCA8418
SCPS215 – SEPTEMBER 2009 ......................................................................................................................................................................................... www.ti.com
PARAMETER MEASUREMENT INFORMATION
V_CCI
SDA
DUT
R_L = 1 kW
C_L = 50 pF
(see Note A)
SDA LOAD CONFIGURATION
Stop
Start
Condition Condition
(P)
(S)
Address
Bit 7
(MSB)
Two Bytes for READ Input Port Register
(see Figure 9)
Address
Bit 1
R/W
Bit 0
(LSB)
ACK
(A)
Data
Bit 7
(MSB)
t_scl
t_sch
SCL
SDA
t_icr
t_buf
t_icf
t_icf
t_icr
t_sth
t_sp
t_vd
t_ocf
t_vd
t_sds
t_sdh
t_vd(ack)
Repeat Start
Condition
Stop
Condition
VOLTAGE WAVEFORMS
Data
Bit 0
(LSB)
Stop
Condition
(P)
t_sts
t_sps
0.7 ´ V_CCI
0.3 ´ V_CCI
0.7 ´ V_CCI
0.3 ´ V_CCI
BYTE
1
2
DESCRIPTION
2
I C address
Input register port data
A. C_L includes probe and jig capacitance. t_ocf is measured with C_L of 10 pF or 400 pF.
B. All inputs are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z_O = 50 Ω, t_r/t_f ≤ 30 ns.
C. All parameters and waveforms are not applicable to all devices.
Figure 13. I²C Interface Load Circuit and Voltage Waveforms
28
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