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AS3661

Datasheet - D e t a i l e d D e s c r i p t i o n

8.10.14 TEMP ADC CONTROL

8.10.15 TEMPERATURE READ

Note: When writing temperature data outside the range of the temperature compensation: Values greater than 89°C

will be set to 89°C; values less than -38°C will be set to -38°C.

Table 49. TEMP ADC CONTROL Register

TEMP ADC CONTROL

Bit

Bit Name

Default

Access

Bit Description

TEMP_MEAS_BUSY

Indicates the status of the temperature measurement ADC of

AS3661.

0: temperature measurements done or not activated.

1: temperature measurement active.

EN_TEMP_SENSOR

R/W

Every time when EN_TEMP_SENSOR is written high a new

measurement period is started. The length of the

measurement period depends on temperature. At 25°C a

measurement takes 20 milliseconds. Temperature can be read

from register 0x3F.

0: temperature sensor disabled.

1: enable internal temperature sensor and start measurement.

CONTINUOUS_CON

R/W

When EN_TEMP_SENSOR bit is set to”1” it is possible to

enable a continuous temperature conversation setting the

CONTINUOUS_CONV bit in this register.

0: new temperature measurement period initiated during

start-up or after exit from power save mode.

1: continuous temperature measurement. Not active when the

device is in powersave.

SEL_EXT_TEMP

R/W

It is possible to link the temperature compensation register

either to the internal temperature measurement result register

0x3F or to the TEMPERATURE WRITE register 0x40. This

temperature measurement device to AS3661 in order to use it

for LED temperature compensation.

0: temperature compensation source register addr 3FH.

1: temperature compensation source register addr 40H.

Table 50. TEMPERATURE READ Register

TEMPERATURE READ

Bit

Bit Name

Default

Access

Bit Description

7:0

TEMPERATURE

_READ

0001 1001

These bits are used for storing an 8-bit temperature reading

acquired from the internal temperature sensor. This register is

a read-only register. Temperature reading is stored in 8-bit

two's complement format, see the table below.

1101 1010: -38°C

...

0001 1001: 25°C

...

0101 1000: 88°C

0101 1001: 89°C

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