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AS3665
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n G e n e r a l P u r p o s e O u t p u t
General Purpose Output
The general purpose output ball can be used as an open drain PWM output pad, an ADC input or as a general purpose
open drain output.
Table 39. LED_Control2 Register
Addr: 03h
LED_Control2 Register
Bit
Bit Name
Default Access
Description
Enable PWM generator driving GPO
7
GPO_on
0b
R/W
0
GPO PWM generator is off
1
The output pad GPO is controlled by register GPO_Control :
Table 40. GPO_Control Register
Addr: 04h
GPO PWM generator is enabled
GPO_Control Register
Bit
Bit Name
Default Access
Description
Define operating mode of GPO ball
00
open drain PWM output
1:0
gpo_mode
00b
R/W
01
open drain output of signal gpo_signal
10
11
don’t use
Status of GPO ball if gpo_mode =01
2
gpo_signal
0b
R/W
0
active low
1
tristate or if used for ADC
Analog to Digital Converter
The AS3665 has a built-in 10-bit successive approximation analog-to-digital converter (ADC). It is internally supplied
by C 2V5 , which is also the full-scale input range (0V defines the ADC zero-code). For input signal exceeding C 2V5 (typ.
2.5V) a resistor divider is used to scale the input of the ADC converter.
Table 41 shows the resolution and input ranges.
Table 41. ADC Input Ranges
Channel
0h
1h
3h-5h
6h-Fh
Pin or Signal
pin INT/AUDIO_IN if
used with audio buffer
junction temperature
ADC TEMPCODE
INT/AUDIO_IN,
GPO, VBAT
VOUT, LED1,
LED2...LED9
Input Range
0.0V - 2.5V
-30oC - 125oC
0.0V - VBAT
0.0V - VOUT
V LSB
NA
ADC TC
ADC LSB
ADC LSB
Note
see section Audio
Input on page 34
see EQ 1
internal voltage
divider
internal voltage
divider
The junction temperature can be calculated according to following formula (ADC TEMPCODE is the result of the ADC
conversion from channel 1h):
T JUNCTION [oC] = ADC TOFFSET - ADC TC * ADC TEMPCODE
(EQ 1)
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