DS2784G+ Maxim Integrated Products, DS2784G+ Datasheet - Page 13

• Manufacturer Part Number: DS2784G+
• Description: IC FUEL GAUGE STND-ALONE 14-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of DS2784G+

• Function: Fuel, Gas Gauge/Monitor
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 2.5 V ~ 4.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-TDFN
• Product: Fuel Gauges
• Operating Supply Voltage: 2.5 V to 4.6 V
• Supply Current: 85 uA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Charge Safety Timers: Yes
• Mounting Style: SMD/SMT
• Temperature Monitoring: Yes
• Uvlo Start Threshold: 2.4 V
• Uvlo Stop Threshold: 2.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PMOD—Power Mode Enable. A value of 1 allows the DS2784 to enter Sleep mode when DQ is low for t
value of 0 disables DQ related transitions to Sleep mode.
RNAOP—Read Net Address Op Code. A value of 0 selects 33h as the op code value for the Read Net Address
command. A value of 1 selects 39h as the Read Net Address opcode value.
0—Reserved bit, must be programmed to 0 for proper operation.
PSPIO—Power-Switch PIO Enable. A value of 1 enables the PIO pin as a power-switch input. A value of 0 disables
the power-switch input function on PIO pin. This control is independent of the PSDQ state.
PSDQ—Power-Switch DQ Enable. A value of 1 enables the DQ pin as a power-switch input. A value of 0 disables
the power-switch input function on DQ pin. This control is independent of the PSPIO state.
X—Reserved Bit.
Li+ PROTECTION CIRCUITRY
During Active mode, the DS2784 constantly monitors SNS, V
(overcharge), undervoltage (overdischarge), and excessive charge and discharge currents (overcurrent, short
circuit). Table 1 summarizes the conditions that activate the protection circuit, the response of the DS2784, and the
thresholds that release the DS2784 from a protection state.
Table 1. Li+ Protection Conditions and DS2784 Responses
Overvoltage. If the voltage on V
delay (t
is set. The DC output remains high during overvoltage to allow discharging. When V
threshold, V
V
Undervoltage. If V
(t
is set, the DS2784 also enters Sleep mode. The DS2784 provides a current-limited recovery charge path (I
PLS to V
0  V
transitions from Sleep to Active mode and the CC and DC outputs are driven high to turn on the charge and
Overcurrent, Discharge
Note 4:
Note 5:
Note 1:
Note 2:
Note 3:
UVD
IN
Overcurrent, Charge
< V
), the DS2784 shuts off the charge and discharge FETs and sets the UV flag in the protection register. If UVEN
Undervoltage
CONDITION
IN
Short Circuit
Overvoltage
CE
OVD
< (V
if a discharge condition persists with V
), the CC pin is driven low to shut off the external-charge FET, and the OV flag in the protection register
All voltages are with respect to V
CC pin driven to V
If V
current limit (I
FETs will turn on once V
With test current I
With test current I
DD
CE
OV
IN
, the DS2784 turns the charge FET on by driving CC high. The DS2784 drives CC high before
< V
to gently charge severely depleted cells. The recovery charge path is enabled when
- 100mV). Once V
UV
IN
when charger connection is detected, release is delayed until V
RC
drops below the undervoltage threshold (V
) to safely charge the battery. If the device does not enter sleep mode for an UV condition (UVEN=0) then the
TST
TST
OLCC
THRESHOLD
flowing from V
flowing from PLS to V
V
V
V
(V
V
V
SNS
SNS
SNS
IN
IN
IN
DD
> V
) for CC off response. DC pin driven to V
> V
< V
< V
> V
> V
IN
IN
UV
OV
UV
exceeds the overvoltage threshold (V
COC
DOC
.
SC
SS
reaches 2.45V (typ), the DS2784 returns to normal operation. The DS2784
.
DD
to PLS (pullup on PLS).
SS
(pulldown on PLS) enabled.
SNS
ACTIVATION
DELAY
t
t
t
t
t
≥ 1.2mV and V
OVD
UVD
OCD
OCD
SCD
13 of 43
IN
, and V
OLDC
UV
IN
CC Off, DC Off,
CC Off, DC Off
RESPONSE
) for a period longer than undervoltage delay
< V
Sleep Mode
(V
SS
IN
CC Off
DC Off
DC Off
OV
PLS
) for DC off response.
≥ V
.
OV
UV
to protect the battery from overvoltage
. The recovery charge path provides an internal
) for a period longer than overvoltage
(2)
IN
falls below the charge enable
V
RELEASE THRESHOLD
IN
< V
V
V
(charger connected)
V
(charger removed)
PLS
PLS
PLS
and V
(load removed)
(load removed)
CE
V
PLS
< V
> V
> V
or (V
IN
> V
DD
DD
DD
< V
SNS
- V
- V
- V
IN
OV
(3)
TP
TP
TP
> 1.2mV
)
(4)
(5)
(5)
RC
SLEEP
) from
. A