Datasheet
MCP4706/4716/4726
DS22272C-page 42 © 2011-2012 Microchip Technology Inc.
TABLE 4-3: STATUS BITS OPERATION
Name Function
RDY/BSY
This bit indicates the state of the EEPROM program memory
1 = EEPROM is not in a programming cycle
0 = EEPROM is in a programming cycle
POR Power-on Reset Status Indicator (flag)
1 = Device is powered on with V
DD
> V
POR
.
Ensure that V
DD
is above V
DD(MIN)
to ensure proper operation.
0 = Device is in powered off state. If this value is read, V
DD
< V
DD(MIN)
< V
POR
.
Unreliable device operation should be expected.
TABLE 4-4: CONFIGURATION BITS
Name Function
V
REF1:VREF0 Resistor Ladder Voltage Reference (V
RL
) Selection bits
0x =V
DD
(Unbuffered)
10 =V
REF
pin (Unbuffered)
11 =V
REF
pin (Buffered)
PD1:PD0 Power-Down Selection bits
When the DAC is powered down, most of the internal circuits are powered off and the op amp is
disconnected from the V
OUT
pin.
00 = Not Powered Down (Normal operation)
01 = Powered Down – V
OUT
is loaded with 1 kΩ resistor to ground.
10 = Powered Down – V
OUT
is loaded with 100 kΩ resistor to ground.
11 = Powered Down – V
OUT
is loaded with 500 kΩ resistor to ground.
Note: See Table 4-2 and Figure 4-7 for more details.
G Gain Selection bit
0 = 1x (gain of 1)
1 = 2x (gain of 2). Not applicable when V
DD
is used as V
RL
Note: If V
REF
= V
DD
, the device uses a gain of 1 only, regardless of the gain selection bit (G)
setting.
TABLE 4-5: CONFIGURATION BIT VALUES AFTER POR/BOR EVENT
R/W R/W R/W R/W R/W Comment
Bit Name VREF1 VREF0 PD1 PD0 G
POR Event 0
(1)
0
(1)
0
(1)
0
(1)
0
(1)
When V
DD
transitions from V
DD
< V
POR
to V
DD
> V
POR
BOR Event 00110When V
DD
transitions from V
DD
> V
BOR
to V
DD
< V
BOR
Note 1: Default configuration when the device is shipped to customer. The POR/BOR value may be modified by
writing the corresponding nonvolatile Configuration bit.
REGISTER 4-1: DAC REGISTER BITS
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Comment
Bit Name
—
(2)
—
(2)
—
(2)
—
(2)
D7 D6 D5 D4 D3 D2 D1 D0 MCP4706
—
(2)
—
(2)
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 MCP4716
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 MCP4726
POR/BOR Event 0
(1)
0
(1)
0
(1)
0
(1)
0
(1)
0
(1)
0
(1)
0
(1)
0
(1)
0
(1)
0
(1)
0
(1)
Note 1: Default configuration when the device is shipped to customer. The POR/BOR value may be modified by
writing the corresponding nonvolatile Configuration bit.
2: This device does not implement this bit, so there is no corresponding POR/BOR value.