AS3689 datasheet(52/72 Pages) AMSOSRAM

52 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

50 - 70

Addr: 1Fh

GPIO control

This register controls pins GPIO pin functions.

Bit

Bit Name

Default

Access

Description.

11= Output (open drain, only pull; only PMOS is active).

3:2

gpio_pulls

R/W

Adds the following pullup/pulldown to pin GPIO; this is

independent of setting of bits gpio_mode.

00 = None

01 = Pulldown

10 = Pullup

11= ADC input (gpio_mode = XX); recommended for analog

signals.

Addr: 20h

GPIO driving cap

This register enables low current mode for GPIOs.

Bit

Bit Name

Default

Access

Description

R/W

reserved

R/W

reserved

gpio_low_curr

R/W

Defines the driving capability of pin GPIO.

0 = Iout

1 = Iout /4

7.6

LED Test

Figure 29 – LED Function Testing

The AS3689 supports the verification of the functionality of the connected LEDs (open and shorted LEDs can be

detected). This feature is especially useful in production test to verify the correct assembly of the LEDs, all its

connectors and cables. It can also be used in the field to verify if any of the LEDs is damaged. A damaged LED

can then be disabled (to avoid unnecessary currents).

The current sources, charge pump, dcdc converter and the internal ADC are used to verify the forward voltage of

the LEDs. If this forward voltage is within the specified limits of the LEDs, the external circuitry is assumed to

operate.

4.7µF

CPOUT

2.2µF

ADC

Baseband

Processor

Interface

Detect Open LEDs

Detect Shorted LEDs

From DCDC

Step Up

Converter

From Charge

Pump

DCDC_FB

I(step_up_vtuning)

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