DS2781 Maxim Integrated Products, DS2781 Datasheet - Page 19

• Manufacturer Part Number: DS2781
• Description: 1-Cell or 2-Cell Standalone Fuel Gauge IC
• Manufacturer: Maxim Integrated Products

CONTROL REGISTER
All CONTROL register bits are read and write accessible. The CONTROL register is recalled from Parameter
EEPROM memory at power-up. Register bit values can be modified in shadow RAM after power-up. Shadow RAM
values can be saved as the power up default values by using the Copy Data command.
Figure 15. Control Register Format
Field
NBEN
UVEN
PMOD
RNAOP
UVTH
Reserved
SPECIAL FEATURE REGISTER
All Special Feature Register bits are read and write accessible, with default values specified in each bit definition.
Figure 16. Special Feature Register Format
Field
Reserved
PIOSC
Address
Address
0:2
1:7
Bit
Bit
7
6
5
4
3
0
60h
15h
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Format
Format
Allowable Values
Negative Blanking Enable
0: Allows negative current readings to always be accumulated
1: Enables blanking of negative current readings up to -25µV
Under Voltage SLEEP Enable
0: Disables transition to SLEEP mode based on VIN voltage
1: Enables transition to SLEEP mode if,
Power Mode Enable
0: Disables transition to SLEEP mode based on DQ logic state
1: Enables transition to SLEEP mode if DQ at a logic low for t
Read Net Address Opcode
0: Read Net Address Command = 33h
1: Read Net Address Command = 39h
Under Voltage Threshold Select
0: Selects an Under Voltage Sleep threshold of 2.45V
1: Selects an Under Voltage Sleep threshold of 4.9V
Undefined
Allowable Values
Undefined
PIO Sense and Control
Read values
0: PIO pin ≤ Vil
1: PIO pin ≥ Vih
Write values
0: Activates PIO pin open-drain output driver, forcing the PIO pin low
1: Disables the output driver, allowing the PIO pin to be pulled high or
Power-up and SLEEP mode default: 1 (PIO pin is hi-Z)
Note: PIO pin has weak pulldown
VIN < V
used as an input
19 of 30
SLEEP
AND DQ stable at either logic level for t
Bit Definition
Bit Definition
SLEEP
SLEEP