Datasheet
MCP4801/4811/4821
DS22244B-page 22 2010 Microchip Technology Inc.
REGISTER 5-1: WRITE COMMAND REGISTER FOR MCP4821 (12-BIT DAC)
REGISTER 5-2: WRITE COMMAND REGISTER FOR MCP4811 (10-BIT DAC)
REGISTER 5-3: WRITE COMMAND REGISTER FOR MCP4801 (8-BIT DAC)
Where:
W-x W-x W-x W-0 W-x W-x W-x W-x W-x W-x W-x W-x W-x W-x W-x W-x
0—GA
SHDN D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
bit 15 bit 0
W-x W-x W-x W-0 W-x W-x W-x W-x W-x W-x W-x W-x W-x W-x W-x W-x
0—GASHDN D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 x x
bit 15 bit 0
W-x W-x W-x W-0 W-x W-x W-x W-x W-x W-x W-x W-x W-x W-x W-x W-x
0—GA
SHDN D7 D6 D5 D4 D3 D2 D1 D0 x xxx
bit 15 bit 0
bit 15
(1)
0 = Write to DAC register
1 = Ignore this command
bit 14 — Don’t Care
bit 13 GA: Output Gain Selection bit
1 =1x (V
OUT
= V
REF
* D/4096)
0 =2x (V
OUT
= 2 * V
REF
* D/4096), where internal V
REF
= 2.048V.
bit 12 SHDN
: Output Shutdown Control bit
1 = Active mode operation. V
OUT is available.
0 = Shutdown the device. Analog output is not available. V
OUT
pin is connected to 500 ktypical)
bit 11-0 D11:D0: DAC Input Data bits. Bit x is ignored.
Note 1: This bit must be ‘0’. The device ignores the write command if this MSB bit is not ‘0’.
Legend
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR 1 = bit is set 0 = bit is cleared x = bit is unknown