MB88141A Fujitsu Media Devices, MB88141A Datasheet - Page 10

• Manufacturer Part Number: MB88141A
• Description: A/D Converter
• Manufacturer: Fujitsu Media Devices

10
MB88141A
2. For D/A Converter + I/O Expander Operation (MOD
(1) I
First S6
First S6
(2) Slave Address Comparison (7 bits)
(3) R/W Selection (1 bit)
S
S
S
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.
When CS2
ignored, and the upper 4 bits of read operations (parallel interface to I
2
C Bus Format
R/W
: Sent from master device
: “Start” condition
0
1
Slave address (7 bits)
Slave address (7 bits)
CS2
0
1
“1” is selected, the upper 4 bits (D7 to D4) of write operations (I
Parallel data input
I
2
C bus input
S0 R/W
S0 R/W
I/O expander operation
0
1
4 channels (AO1 to AO4)
8 channels (AO1 to AO8)
P
parallel data output
: Sent from MB88141A (slave device)
: “Stop” condition
A
A
D/A converter
C7
I
D7
2
C bus output
Digital data (8 bits)
Channel selection
(8 bits)
C0
D0
“H”)
A
A
2
C bus) are output at “0” (low) .
I
2
C bus input
Last
D7
D/A converter operation
P
Digital data (8 bits)
A
2
C bus to parallel interface) are
8 bits (D7 to D0)
4 bits (D3 to D0)
: “Acknowledge” output
I/O expander
analog output
D0
A
Last
P