TCA9538 Datasheet, PDF (10/37 Pages) Texas Instruments – Low Voltage 8-Bit I2C and SMBus Low-Power I/O Expander

TCA9538
SCPS199C – AUGUST 2014 – REVISED OCTOBER 2015
7 Parameter Measurement Information
V_CC
DUT
R_L = 1 kΩ
SDA
C_L = 50 pF
(see Note A)
SDA LOAD CONFIGURATION
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Stop
Start Address
Condition Condition Bit 7 ^Address
(P)
(S)
(MSB) ^{Bit 6}
Three Bytes for Complete
Device Programming
R/W
Address _{Bit 0}
Bit 1 _(LSB)
ACK
(A)
Data
Bit 07
(MSB)
Data
Stop
Bit 10 Condition
(LSB)
(P)
t_scl
t_sch
SCL
t_buf
SDA
t_icr
t_icf
t_PHL
t_sts
t_sp
t_PLH
t_icf
t_sth
Start or
Repeat
Start
Condition
t_icr
t_sds
t_sdh
Repeat
Start
Condition
VOLTAGE WAVEFORMS
t_sps
Stop
Condition
0.7 × V_CC
0.3 × V_CC
0.7 × V_CC
0.3 × V_CC
BYTE
1
2, 3
DESCRIPTION
I²C address
P-port data
A. C_L includes probe and jig capacitance.
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 9. I²C Interface Load Circuit and Voltage Waveforms
10
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