Datasheet

14
LTC1759
POWER-ON
WORD BIT RESET VALUE ALLOWED VALUES
FUNCTION FIELD MAPPING (BINARY)
THERM_UR 11 Value • 0 – Thermistor Indicates Not Underrange
• 1 – Thermistor Indicates Underrange
• Read Only. Write Will NACK
ALARM_INHIBITED 12 0 • 0 – Charger Not Alarm Inhibited
• 1 – Charger Alarm Inhibited. This Bit Is Set but Never Cleared by
AlarmWarning()
• Read Only. Write Will NACK
• Cleared to Power-On Reset Value When:
1) POR_RESET = 1
2) BATTERY_PRESENT = 0
3) AC_PRESENT = 0
4) A Valid ChargingVoltage(), ChargingCurrent() Pair Is Received
POWER_FAIL 13 Value • 0 – V
BAT
/V
DCIN
< 0.9
• 1 – V
BAT
/V
DCIN
> 0.9
• Read Only. Write Will NACK
BATTERY_PRESENT 14 Value • 0 – Battery Is Not Present
• 1 – Battery Is Present
• Read Only. Write Will NACK
AC_PRESENT 15 Value • 0 – Charge Power Is Not Available
• 1 – Charge Power Is Available
• Read Only. Write Will NACK
ChargingCurrent() CHARGING_CURRENT 15:0 0 • Unsigned Integer Representing Charger Current in mA
[15:0] • Three Possible Responses
– Supply the Current Requested
– Supply Its Programmatic Maximum Current If the Request Is
Greater Than Its Programmatic Value and Less Than hffff
– Supply Its Maximum Safe Current If the Request Is hffff [Supply
Current Required to Meet ChargingVoltage()].
• Write Only. Read Will NACK
ChargingVoltage() CHARGING_VOLTAGE 15:0 0 • Unsigned Integer Representing Charger Voltage in mV
[15:0] • Three Possible Responses
– Supply the Voltage Requested
– Supply Its Programmatic Maximum Voltage If the Request Is
Greater Than Its Programmatic Value and Less Than hffff
– Supply Its Maximum Voltage If the Request Is hffff [Supply
Voltage Required to Meet ChargingCurrent()].
• Write Only. Read Will NACK
AlarmWarning() OVER_CHARGED_ 15 0 • 1 – Terminate Charging Immediately
ALARM • Write Only. Read Will NACK
• Writing a 0 to This Bit Will Be Ignored
TERMINATE_CHARGE_ 14 0 • 1 – Terminate Charging Immediately
ALARM • Write Only. Read Will NACK
• Writing a 0 to This Bit Will Be Ignored.
RESERVED_ALARM1 13 0 • 1 – Terminate Charging Immediately
• Write Only. Read Will NACK
• Writing a 0 to This Bit Will Be Ignored.
OVER_TEMP_ALARM 12 0 • 1 – Terminate Charging Immediately
• Write Only. Read Will NACK
• Writing a 0 to This Bit Will Be Ignored.
OPERATIO
U