XRA1207 Datasheet, PDF (14/17 Pages) Exar Corporation – 16-BIT I2C/SMBUS GPIO EXPANDER

XRA1207
16-BIT I2C/SMBUS GPIO EXPANDER WITH INTEGRATED LEVEL SHIFTERS
FIGURE 6. I²C-BUS TIMING DIAGRAM
Protocol
SCL
START
condition
(S)
Bit 7
MSB
(A7)
TSU;STA
TLOW THIGH
Bit 6
(A6)
1/F_SCL
T_F
TR
TBUF
SDA
Bit 0
LSB
(R/W)
Acknowledge
(A)
STOP
condition
(P)
T_SP
THD;STA
TSU;DAT
THD;DAT
TVD;DAT
TVD;ACK
TSU;STO
REV. 1.0.0
FIGURE 7. WRITE TO OUTPUT
SDA
GPIOn
SLAVE
ADDRESS
WA
COMMAND
BYTE
A
DATA
A
TD1
FIGURE 8. GPIO PIN INTERRUPT
ACK from slave
ACK from slave
SDA
SLAVE
ADDRESS
WA
COMMAND
BYTE
AS
SLAVE
ADDRESS
RA
ACK from m aster
DATA
AP
IN T #
TD4
TD5
Px
14