DS273 Просмотр технического описания (PDF) - Maxim Integrated
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DS273 Datasheet PDF : 20 Pages
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Cache-Memory Battery-Backup Management IC
ASYNCHRONOUS ENC TRUE OR
FROM ANY STATE POWER-ON RESET (POR)
VBATT+ < VMIN
INITIATE*
DONE LED ACTIVE
TIMERS RESET
NO CURRENT FLOW
VBATT > VDIV
VBATT+ < VDIV
VBATT+ ≥= VMIN
DONE
DONE LED ACTIVE
TIMERS RESET
NO CURRENT FLOW
PRECONDITION
CHARGE LED ACTIVE
PRECONDITION TIMER ACTIVE
CURRENT REGULATED TO IPRE
VBATT+ ≥= VMIN
CONSTANT-CURRENT CHARGE
CHARGE LED ACTIVE
SAFETY TIMER ACTIVE
CURRENT REGULATED BY RSET**
ISNS < ITERMINATE
ENC TOGGLED FALSE
THEN TRUE OR POR
PRECONDITION
TIMEOUT
SAFETY TIMEOUT
FAULT
FAULT LED ACTIVE, TIMERS INACTIVE,
NO CURRENT FLOW
SAFETY TIMER FAULT CONDITION
TEMPERATURE FAULT CONDITION
VBATT+ ≥= VMARGIN
CONSTANT-VOLTAGE CHARGE
CHARGE LED ACTIVE
SAFETY TIMER ACTIVE
CURRENT REGULATED BY RMARGIN
SAFETY TIMEOUT
RETURN TO
PREVIOUS STATE
TTHERMISTOR = THYS-HOT AND
TTHERMISTOR = THYS-COLD AND
TDS2731 = THYS-PROTECT
ASYNCHRONOUS
FROM ANY STATE
TTHERMISTOR > THOT OR
TTHERMISTOR < TCOLD OR
TDS2731 > TPROTECT
*VIN > VUVLO-CHG, VAUX > 3.08V MUST EXIST BEFORE CHARGER OPERATES.
**IF THE DS2731 DIE TEMPERATURE EXCEEDS TCHOKE, THE DS2731 BEGINS REDUCING CHARGE CURRENT BELOW THE RSET VALUE TO PROTECT THE IC.
Figure 3. Charger State Diagram
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