FS5908

Rev. 1.2

11/22

13. Function Description

13.1 Temperature Measurement

FS5908 measures the environmental temperature around the chip, and updates the temperature value in

digital format via the register. Users can read these updated temperature values at any time through I2C

interface.

13.2 Overheat/Overcool Warning

FS5908 can set up one set of the warning temperatures TUpLim and TLowLim (See below diagram). When the

measured temperature reaches the warning temperature, the ALARM signal will notify microprocessor or

enable directly the cooler fan, heater and so on. The related warning temperature of ALARM is decided by

upper bound register (TUpLim) and lower bound register (TLowLim) that can be changed at any time as

request.

T

UpLim

T

LowLim

ALARM Output Change

According to Temperature

T

★★

★

Temperature

Changing Curve

ALARM (Comparision Mode.

int/cmp is 0; arm_inv is 0)

[Apply to Overheat W arning

Mode]

ALARM (Interrupt Mode,

int/cmp is 1; arm_inv is 0)

[Apply to Overheat or

Overcool W arning Mode]

★★

★

ALARM (Comparision Mode,

int/cmp is 0; arm_inv is 1)

[Apply to Overcool W arning

Mode]

ALARM (Interrupt Mode,

int/cmp is 1; arm_inv is 1)

[Improper Mode]

★

register of FS5908 is read or the system enters the stand-by mode.