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XT65/XT75 Hardware Interface Overview

6.5 Pin Assignment and Signal Description

XT65_XT75_HO_v00.130 Page 40 of 67 2006-10-12

Confidential / Preliminary

Analog

Digital

Converter

ADC1_IN I Input voltage: VImin = 0V, VImax =

2.4V

≈ 750kOhms Measurement inter-

val: 100ms - 30s selectable by AT

command

Sensitivity, accuracy: 2400 steps

(1step = 1mv)

Cut-off frequency: 30 Hz

Underflow:

≥ -25mV

Overflow:

≥ +2425 mV

Accuracy:

± 0.5mV

Linear error:

± 0.5mV

Temperature error:

± 0.5mV

Burst error:

± 0.5mV

Inputs used for measuring exter-

nal voltages. In the range of 0mV

to 2400mV.

Use the command AT^SRADC to

select analog inputs ADC1_IN or

ADC2_IN, to set the measurement

mode and read out the results.

The values are indicated in mV.

ADC1_IN and ADC2_IN are inter-

nally multiplexed through analog

switch.

Important:

For restrictions during SLEEP

mode see

ADC2_IN I

Digital

Analog

Converter

DAC_OUT O V

max = 0.2V at I = 2mA

min = 2.55V at I = -0.5mA

max = 3.05V

PWM signal which can be

smoothed by an external filter.

Use the AT^SWDAC command to

open and configure the DAC_OUT

output.

Table 17: Signal description

Function Signal name IO Signal form and level Comment

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 57 58

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