
XT65/XT75 Hardware Interface Overview
6.5 Pin Assignment and Signal Description
s
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
Ri
≈
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
1
.
ADC2_IN
I
Digital
Analog
Converter
DAC_OUT
O
V
OL
max = 0.2V at I = 2mA
V
OH
min = 2.55V at I = -0.5mA
V
OH
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