AS3688 datasheet(57/72 Pages) AMSOSRAM

57 / 72 page

AS3688

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (ptr,tje)

Revision 1.1.1 / 20060707

55 - 70

Figure

32 – ADC Pin Connections (TBD: TODO: Add new channels)

GPIO Input

Buffers

DD_GPIO

D9:0

gpio_select

10-bit SAR

ADC

V2_5

To avoid unwanted supply currents

when an analog signal is applied to a

GPIO pin, the GPIO Input Buffers are

turned off when gpio x_pulls = 11.

GPIO1

GPIO0

CURR2

CURR1

CURR30

CURR4

RGB1

7.8

Power-On Reset

The internal reset is controlled by two sources:

VBAT3 Supply

VDD_GPIO Voltage

If one of the voltages is lower than its limit, the internal reset is forced.

The reset levels control the state of all registers. As long as VBAT and VDD_GPIO are below their reset

thresholds, the register contents are set to default. Access by serial interface is possible once the reset

thresholds are exceeded.

Table

23 – Reset Levels

Symbol

Parameter

Min

Typ

Max

Unit

Note

VPOR_VBAT

Overall Power-On

Reset

2.0

Monitor voltage on V2_5; power-on

reset for all internal functions;

startup is guaranteed with

VBAT>=3.0V

VGPIO_Vdd_TH_RISI

Reset Level for

VDD_GPIO Rising

1.3

1.5

Monitor voltage on pin VDD_GPIO;

rising level.

VGPIO_vdd_TH_FAL

LING

Reset Level for

VDD_GPIO Falling

1.0

Monitor voltage on pin VDD_GPIO;

falling level.

7.9

Temperature Supervision

An integrated temperature sensor provides over-temperature protection for the AS3688. This sensor generates a

flag if the device temperature reaches the overtemperature threshold of 140º. The threshold has a hysteresis to

prevent oscillation effects.

AS3688 Datasheet(PDF) 57 Page - ams-OSRAM AG

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