MB88146A Datasheet, PDF (7/20 Pages) Fujitsu Component Limited. – D/A Converter for Digital Tuning (12-channel, 8-bit, on-chip OP amp., low-voltage)

MB88146A
• I/O Expander [Channel select = “1101”]: Serial → Parallel Conversion
Performs parallel conversion of data bits D4 to DF for output on pins D0 to D11.
Note that only those pins designated for output in the ESR (expander status register) are output.
Shift register
DF DE DD DC DB DA D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
↓↓↓↓↓↓↓↓↓↓↓↓
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 ^{Parallel I/O pins (output state)}
• I/O Expander [Channel select = “1110”]: Parallel → Serial Conversion
Writes data from D0 to D11 pins to bits D4 to DF in the shift register.
Data is output to the SO pin on the shift clock (CLK) signal (The first 4 bits output data D0 to D3, so the
converted output should be read as data bits 5 through 16.).
Note that the data value is “0” for pins designated for output in the ESR (expander status register) as well as
analog output pins.
Shift register
DF DE DD DC DB DA D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
↑↑↑↑↑↑↑↑↑↑↑↑
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 ^{Parallel I/O pins (output state)}
• Expander Status Register [Channel select = “1111”]
Shift register
DF DE DD DC DB DA D9 D8 D7 D6 D5 D4 ^ESR
↓↓↓↓↓↓↓↓↓↓↓↓
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
This register sets the status of each pin.
Setting
“0”
“1”
Pin status
• Input standby status (Hi-Z output)
• D11 to D4 pins used for analog output should be set to “0.”
• Output state
7