MCP4725 Microchip Technology, MCP4725 Datasheet - Page 15

• Manufacturer Part Number: MCP4725
• Description: 12-Bit Digital-to-Analog Converter
• Manufacturer: Microchip Technology

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5.5
The device has two modes of operation: Normal mode
and power-down mode. The mode is selected by
programming the power-down bits (PD1 and PD0) in
the Configuration register. The user can also program
the two power-down bits in non-volatile EEPROM
memory.
When the normal mode is selected, the device
operates a normal digital-to-analog conversion. If the
power-down mode is selected, the device enters a
power saving condition by shutting down most of the
internal circuits. During the power-down mode, all
internal circuits except the I
and there is no data conversion event, and no V
available. The device also switches the output stage
from the output of the amplifier to a known resistive
load. The value of the resistive load is determined by
the state of the power-down bits (PD1 and PD0).
Table 5-2
and the resistive load.
During the power-down mode, the device draws about
60 nA (typical). Although most of internal circuits are
shutdown, the serial interface remains active in order
to receive the I
The device exits the power-down mode immediately
when (a) it receives a new write command for normal
mode or (b) it receives an I
Command.
When the DAC operation mode is changed from
power-down to normal mode, the output settling time
takes less than 10 µs, but greater than the standard
Active mode settling time (6 µs, typical).
TABLE 5-2:
© 2007 Microchip Technology Inc.
Note 1:
PD1
0
0
1
1
Normal and Power-Down Modes
shows the outcome of the power-down bit
In the power-down mode: V
most of internal circuits are disabled.
PD0
2
0
1
0
1
C command.
POWER-DOWN BITS
Normal Mode
1 kΩ resistor to ground
100 kΩ resistor to ground
500 kΩ resistor to ground
2
2
C General Call Wake-Up
C interface are disabled
Function
OUT
is off and
(1)
(1)
(1)
OUT
is
FIGURE 5-1:
Power-Down Mode.
OP
Amp
Control Circuit
Power-Down
Resistive String DAC
Output Stage for
Resistive
Load
MCP4725
1 kΩ
DS22039C-page 15
100 kΩ 500 kΩ
V
OUT