DAC8571IDGKRG4 Datasheet, PDF (21/31 Pages) Texas Instruments – 16-BIT, LOW POWER, VOLTAGE OUTPUT

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DAC8571
SLAS373A – DECEMBER 2002 – REVISED JULY 2003
MS and LS bytes represent temporary and DAC register data
MS and LS bytes represent I²C data that is discarded
MS and LS bytes represent I²C data that is discarded
MS and LS bytes represent temporary and DAC register data
EXAMPLES (A0 TIED TO GND, VDD = 5 V)
EXAMPLE 1: Write 1/4 scale to DAC8571
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 1000
ACK 0001 0000
ACK
0100 0000
ACK
0000 0000 ACK STOP
Previous output voltage is valid
Vout = 1.25 V
EXAMPLE 2: Switch DAC8571 to fast settling mode
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 1000
ACK 0001 0001
ACK
0010 0000
ACK
0000 0000 ACK STOP
Previous output voltage is valid
Vout = 0 V
EXAMPLE 3: Switch DAC8571 back to low power mode
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 1000
ACK 0001 0001
ACK
0000 0000
ACK
0000 0000 ACK STOP
Previous output voltage is valid
Vout = 0 V
EXAMPLE 4: Power-down DAC8571 with Hi-Z output
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 1000
ACK 0001 0001
ACK
1100 0000
ACK
0000 0000 ACK STOP
Previous output voltage is valid
Vout = Hi-Z
EXAMPLE 5: Power-down DAC8571 with 1K output impedance to ground
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 1000
ACK 0001 0001
ACK
0100 0000
ACK
0000 0000 ACK STOP
Previous output voltage is valid
Vout = 0 V
EXAMPLE 6: Power-down DAC8571 with 100K output impedance to ground
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 1000
ACK 0001 0001
ACK
1000 0000
ACK
0000 0000 ACK STOP
Previous output voltage is valid
Vout = 0 V
EXAMPLE 7: Store full scale data in temporary register
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 1000
ACK 0000 0000
ACK
1111 1111
ACK
1111 1111 ACK STOP
Previous output voltage is valid
EXAMPLE 8: Update DAC8571 with the data previously stored in the temporary register
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 1000
ACK
0010 0000
ACK XXXX XXXX ACK XXXX XXXX ACK STOP
Previous output voltage is valid
New Vout valid
EXAMPLE 9: Broadcast a powerdown command to all DAC8571s on the I²C bus
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 0000
ACK
0011 0101 ACK 1100 0000
ACK
0000 0000 ACK STOP
Previous output voltage is valid
Vout = Hi-Z
EXAMPLE 10: Broadcast update. All DAC8571s on the I²C bus update synchronously with the contents of their temporary
registers
ADDRESS <7...0>
C<7...0>
M<7...0>
L<7...0>
START
1001 0000
ACK
0011 0000
ACK XXXX XXXX ACK XXXX XXXX ACK STOP
Previous output voltage is valid
New Vout valid
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