Rainbow Electronics DS2784 - Manual (Page 11)

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
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a 1 to bits 4 to 7 has no effect on the register. Bits 0 and 1 are set on power-up and a transition from Sleep to
Active modes. While in Active mode, these bits can be cleared to disable the FET gate drive of either or both FETs.
Setting these bits only turns on the FETs if there are no protection faults.
ADDRESS 00h
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
OV UV COC DOC CC DC CE DE
OV
—Overvoltage Flag. OV is set to indicate that an overvoltage condition has been detected. The voltage on V
IN
has persisted above the V
OV
threshold for t
OV
. OV remains set until written to a 0 or cleared by a power-on reset or
transition to Sleep mode.
UV
—Undervoltage Flag. UV is a read-only mirror of the UVF flag located in the status register. UVF is set to
indicate that V
IN
< V
UV
. The UVF bit must be written to 0 to clear UV and UVF.
COC
—Charge Overcurrent Flag. COC is set to indicate that an overcurrent condition has occurred during a charge.
The sense-resistor voltage has persisted above the V
COC
threshold for t
OC
. COC remains set until written to a 0,
cleared by a power-on reset, or transition to Sleep mode.
DOC—
Discharge Overcurrent Flag. DOC is set to indicate that an overcurrent condition has occurred during a
discharge. The sense-resistor voltage has persisted above the V
DOC
threshold for t
OC
. DOC remains set until written
to a 0, cleared by a power-on reset, or transition to Sleep mode.
CC
—Charge Control Flag. CC indicates the logic state of the CC pin driver. CC flag is set to indicate CC high. CC
flag is cleared to indicate CC low. CC flag is read only.
DC
—Discharge Control Flag. DC indicates the logic state of the DC pin driver. DC flag is set to indicate DC high.
DC flag is cleared to indicate DC low. DC flag is read only.
CE
—Charge Enable Bit. CE must be set to allow the CC pin to drive the charge FET to the on state. CE acts as an
enable input to the safety circuit. If all safety conditions are met AND CE is set, the CC pin drives to V
CP
. If CE is
cleared, the CC pin is driven low to disable the charge FET.
DE
—Discharge Enable Bit. DE must be set to allow the DC pin to drive the discharge FET to the on state. DE acts
as an enable input to the safety circuit. If all safety conditions are met AND DE is set, the DC pin drives to V
CP
. If
DE is cleared, the DC pin is driven low to disable the charge FET.
PROTECTOR THRESHOLD REGISTER FORMAT
The 8-bit threshold register consists of bit fields for setting the overvoltage threshold, charge overcurrent threshold,
discharge overcurrent threshold, and short-circuit threshold for the protection circuit.
ADDRESS 7Fh
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
VOV4 VOV3 VOV2 VOV1 VOV0 SC0 OC1 OC0