Rainbow Electronics DS2781 - Manual (Page 19)

DS2781: Two-Cell Standalone Fuel Gauge IC
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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
Address 60h Bit Definition
Field Bit Format Allowable Values
NBEN 7 Read/Write
Negative Blanking Enable
0: Allows negative current readings to always be accumulated
1: Enables blanking of negative current readings up to -25µV
UVEN 6 Read/Write
Under Voltage SLEEP Enable
0: Disables transition to SLEEP mode based on VIN voltage
1: Enables transition to SLEEP mode if,
VIN < V
SLEEP
AND DQ stable at either logic level for t
SLEEP
PMOD 5 Read/Write
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
SLEEP
RNAOP 4 Read/Write
Read Net Address Opcode
0: Read Net Address Command = 33h
1: Read Net Address Command = 39h
UVTH 3 Read/Write
Under Voltage Threshold Select
0: Selects an Under Voltage Sleep threshold of 2.45V
1: Selects an Under Voltage Sleep threshold of 4.9V
Reserved 0:2 Undefined
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
Address 15h Bit Definition
Field Bit Format Allowable Values
Reserved 1:7 Undefined
PIOSC 0 Read/Write
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
used as an input
Power-up and SLEEP mode default: 1 (PIO pin is hi-Z)
Note: PIO pin has weak pulldown