DS2790G+T&R Maxim Integrated Products, DS2790G+T&R Datasheet - Page 14

• Manufacturer Part Number: DS2790G+T&R
• Description: IC FUEL GAUGE BATT 28-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of DS2790G+T&R

• Function: Fuel, Gas Gauge/Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS2790 Programmable 1-Cell Li-Ion Fuel Gauge and Protector
DS2790 POWER MODES
When power is first applied to the DS2790, a Power-on-Reset (POR) circuit transitions the IC to Brown-Out State
where cell voltage is monitored. If V
voltage is above the brown-out threshold V
, the DS2790 enters CPU state
DD
BO
and begins code execution. Firmware determines if the IC switches to ANALOG State or low-power SLEEP States
when a STOP halts CPU operation.
The DS2790 enters SLEEP state after a CPU STOP if the ADC, the protector, and all internal timers are disabled.
In SLEEP State, all IC operation becomes inactive except for external activity interrupts. Brown-Out detection does
not occur in SLEEP State. Any interrupt generated by 2-wire port communication, external input on ports P0.0 or
P0.1, or a charger detection on PLS will transition the DS2790 from SLEEP to Brown-Out to verify cell voltage
before returning to CPU State. The DS2790 enters ANALOG State after a CPU STOP if any one of the following is
active: the ADC, the protector, the interval timer or the watchdog timer. An external interrupt or an interrupt from
any active internal circuit causes the DS2790 to transition back to CPU State to service the condition.
If the DS2790 is in ANALOG or CPU State, and V
falls below V
, a brown-out condition occurs and the DS2790
DD
BO
enters the Brown-Out State. In Brown-Out State, the processor is halted without changing the instruction pointer. If
V
voltage rises above V
within a time of t
, the DS2790 returns to CPU state and generates a brown-out
DD
BO
SU:OSCI
interrupt (if enabled). Otherwise, if V
remains below V
for t
, the DS2790 enters an inactive state where it
DD
BO
SU:OSCI
waits for a charger to be applied. When charge voltage is sensed on PLS, the DS2790 returns to the Brown-Out
State where V
voltage is verified before returning to CPU State.
DD
Figure 5. DS2790 State Diagram
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