BU2098F_15 Datasheet, PDF (8/18 Pages) Rohm – Serial in/Parallel out Drivers

BU2098F
Function – continued
1.4 Write DATA
Send the stave address from master following the start condition (S). This address consists of 7 bits. The left 1 bit (the
foot bit) is fixed “0”. The stop condition (P) is needed to finish the data transferred. But the re-send starting condition
(Sr) enables to transfer the data without STOP (P).
S slave address R/W ACK DATA ACK P
“0” (Write)
S slave address R/W ACK DATA ACK Sr slave address R/W ACK DATA ACK P
“0” (Write)
“0” (Write)
Figure 11. DATA transmit
1.5 Data format
The format is following.
S A6 A5 A4 A3 A2 A1 A0 R/W ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK P
SLAVE ADDRESS
WRITE DATA
Figure 12. Data format
Slave address
Write Data
A0 to A2
A3 to A6
R/W
D0 to D7
Table 1. for WRITE format
Each bit can be defined by the input levels of pins A0 to A3.
These 4 bits are fixed.
“0”
Write “1” to D0 makes Q0 pin High-impedance. And write “0” makes
Q0 pin LOW. D[1:7] and Q[1:7] are same as D0 and Q0.
Table 2. for (A2, A1, A0) to SLAVE ADDRESS
A6
A5
A4
A3
A2
A1
A0
Slave address
0
1
1
1
0
0
0
38H
0
1
1
1
0
0
1
39H
0
1
1
1
0
1
0
3AH
0
1
1
1
0
1
1
3BH
0
1
1
1
1
0
0
3CH
0
1
1
1
1
0
1
3DH
0
1
1
1
1
1
0
3EH
0
1
1
1
1
1
1
3FH
Fixed for BU2098F
Defined by external pin A0～A2
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TSZ22111・15・001
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TSZ02201-0RHR1GZ00100-1-2
01.Sep.2015 Rev.002