AS3689 datasheet(55/72 Pages) AMSOSRAM

55 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

53 - 70

Table 23 – ADC Parameters

Symbol

Parameter

Min

Typ

Max

Unit

Note

measurement

Ratioprescaler

Ratio of Prescaler

0.4

For all low voltage current sinks,

CP_OUT and VBAT2

VGPIOCURR

Voltage Compliance of

current source for GPIO

0.0

1.35

IGPIOCURR

Current Accuracy for

GPIO current source

-1.0µA

1-15µA

+1.0µA

Current Source for pin GPIO

Transient Parameters (2.5V, 25 ºC)

Conversion Time

µ s

Clock Frequency

1.0

MHz

Settling Time of S&H

µ s

All signal are Internally

generated and triggered by

start_conversion

The junction temperature (TJUNCTION) can be calculated with the following formula (ADCTEMP_CODE is the adc

conversion result for channel 04h selected by register adc_select = 000100b):

TJUNCTION [°C] = ADCTOFFSET - ADCTC · ADCTEMP_CODE

7.7.1 ADC Registers

Addr: 27h

ADC_MSB Result

Together with Register 27h, this register contains the results (MSB) of an ADC cycle.

Bit

Bit Name

Default

Access

Description

6:0

D9:D3

N/A

ADC results register.

result_not_ready

N/A

Indicates end of ADC conversion cycle.

0 = Result is ready.

1 = Conversion is running.

Addr: 28h

ADC_LSB Result

Together with Register 28h, this register contains the results (LSB) of an ADC cycle

Bit

Bit Name

Default

Access

Description

2:0

D2:D0

N/A

ADC result register.

7:3

N/A

Addr: 26h

ADC_control

This register input source selection and initialization of ADC.

Bit

Bit Name

Default

Access

Description

5:0

adc_select

R/W

Selects input source as ADC input.

000000 (00h) = reserved

000001 (01h) = reserved

000010 (02h) = GPIO

000011 (03h) = GPI

000100 (04h) = reserved

000101 (05h) = RGB1

000110 (06h) = RGB2

000111 (07h) = RGB3

001000 (08h) = CURR1

001001 (09h) = CURR2

001010 (0Ah) = CURR30

001011 (0Bh) = CURR31

001100 (0Ch) = CURR32

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