AS3665 datasheet(33/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - D e taile d D e scri pti on Gen eral Pu rpose Out pu 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.

The output pad GPO is controlled by register GPO_Control:

Analog to Digital Converter

The AS3665 has a built-in 10-bit successive approximation analog-to-digital converter (ADC). It is internally supplied

by C2V5, which is also the full-scale input range (0V defines the ADC zero-code). For input signal exceeding C2V5 (typ.

2.5V) a resistor divider is used to scale the input of the ADC converter.

Table 41 shows the resolution and input ranges.

The junction temperature can be calculated according to following formula (ADCTEMPCODE is the result of the ADC

conversion from channel 1h):

TJUNCTION [ºC] = ADCTOFFSET - ADCTC * ADCTEMPCODE

(EQ 1)

Table 39. LED_Control2 Register

Addr: 03h

LED_Control2 Register

Bit

Bit Name

Default Access

Description

GPO_on

R/W

Enable PWM generator driving GPO

GPO PWM generator is off

GPO PWM generator is enabled

Table 40. GPO_Control Register

Addr: 04h

GPO_Control Register

Bit

Bit Name

Default Access

Description

1:0

gpo_mode

00b

R/W

Define operating mode of GPO ball

open drain PWM output

open drain output of signal gpo_signal

don’t use

gpo_signal

R/W

Status of GPO ball if gpo_mode=01

active low

tristate or if used for ADC

Table 41. ADC Input Ranges

Channel

Pin or Signal

Input Range

VLSB

Note

pin INT/AUDIO_IN if

used with audio buffer

0.0V - 2.5V

see section Audio

Input on page 34

junction temperature

ADCTEMPCODE

-30ºC - 125ºC

ADCTC

see EQ 1

3h-5h

INT/AUDIO_IN,

GPO, VBAT

0.0V - VBAT

ADCLSB

internal voltage

divider

6h-Fh

VOUT, LED1,

LED2...LED9

0.0V - VOUT

ADCLSB

internal voltage

divider

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