Datasheet

15
LTC1759
POWER-ON
WORD BIT RESET VALUE ALLOWED VALUES
FUNCTION FIELD MAPPING (BINARY)
TERMINATE_ 11 0 • This Bit May Be Used to Signal That the Charger May Be Restarted
DISCHARGE_ALARM After a Battery Conditioning Cycle Has Been Completed
• Write Only. Read Will NACK
• Writing a 0 to This Bit Will Be Ignored
• Not Supported by LTC1759
Reserved 10 – • Not Supported by LTC1759
• Write Only. Read Will NACK
REMAINING_ 9 – • Intended for Host
CAPACITY_ALARM • Not Supported by LTC1759
• Write Only. Read Will NACK
REMAINING_TIME_ 8 – • Intended for Host
ALARM • Not Supported by LTC1759
• Write Only. Read Will NACK
INITIALIZED 7 – • Intended for Host
• Not Supported by LTC1759
• Write Only. Read Will NACK
DISCHARGING 6 – • Intended for Host
• Not Supported by LTC1759
• Write Only. Read Will NACK
FULLY_CHARGED 5 – • Intended for Host
• Not Supported by LTC1759
• Write Only. Read Will NACK
FULLY_DISHARGED 4 – • Intended for Host
• Not Supported by LTC1759
• Write Only. Read Will NACK
ERROR 3:0 – • Intended for Host
• All Bits Set High Prior to AlarmWarning() Transmission
• Not Supported by LTC1759
• Write Only. Read Will NACK
LTCVersionFunction LTC_VERSION 15:0 0101hex • Returns LTC Version Number
() • Read Only
• Always Returns 0101hex
OPERATIO
U
SMBus Accelerator Pull-Ups
Both SCL and SDA have SMBus accelerator circuits which
reduce the rise time on systems with significant capaci-
tance on the two SMBus signals. The dynamic pull-up
circuitry detects a rising edge on SDA or SCL and applies
2mA to 5mA pull-up to V
DD
for approximately 1µs (exter-
nal pull-up resistors are still required to supply DC cur-
rent). This action allows the bus to meet SMBus rise time
requirements with as much as 150pF on each SMBus
signal. The improved rise time will benefit all of the devices
which use the SMBus, especially those devices that use
the I
2
C logic levels. Note that the dynamic pull-up circuits
only pull to V
DD
, so some SMBus devices that are not
compliant to the SMBus specifications may still have rise
time compliance problems if the SMBus pull-up resistors
are terminated with voltages higher than V
DD
.