MB88141 Datasheet, PDF (8/20 Pages) Fujitsu Component Limited. – D/A Converter for Digital Tuning (With Built-in OP Amp and I/O Expander)

MB88141
2. For D/A Converter + I/O Expander Operation (MOD = “H”)
(1) I²C Bus Format
First S6
S0 R/W
D7
D0
Last
S Slave address (7 bits) 1 A
Digital data (8 bits)
AP
First S6
S0 R/W
S Slave address (7 bits) 0 A
C7
C0
Channel selection (8 bits) A
D7
D0
Digital data (8 bits)
Last
AP
: Sent from master device
: Sent from MB88141 (slave device)
S: “Start” condition P: “Stop” condition A: “Acknowledge” output
(2) Slave Address Comparison (7 bits)
Slave address comparison is the same as for D/A converter (12-channel) operation (see “1. (2) “Slave Address
Comparison”), with the exception that the CS2 setting determines the number of D/A converter channels and
the number of I/O expander bits.
CS2
D/A converter
I/O expander
0
4 channels (AO1 to AO4)
8 bits (D7 to D0)
1
8 channels (AO1 to AO8)
4 bits (D3 to D0)
When CS2 = “1” is selected, the upper 4 bits (D7 to D4) of write operations (I²C bus to parallel interface) are
ignored, and the upper 4 bits or read operations (parallel interface to I²C bus) are output at “0” (low).
(3) R/W Selection (1 bit)
R/W
0
1
I/O expander operation
I²C bus input → parallel data output
Parallel data input → I²C bus output
D/A converter operation
I²C bus input → analog output
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