Tait TM8000 Series Applications Manual page 22

Table 2.6 Auxiliary connector - DC characteristics
Parameter
min.
Digital signals
Input low level:
All inputs
AUX_GPI2
Input high level:
All inputs 1.7
AUX_GPI2 V
s
AUX_GPI3 2.6
Input low current:
All other inputs
AUX_GPI2
AUX_GPI3
AUX_RXD
Input high current:
AUX_RXD
All other inputs
Output low level:
AUX_GPIO4-7
AUX_TXD
Output high level:
AUX_GPIO4-7 3.1
AUX_TXD 2.4
Safe DC input limits:
AUX_GPI1-3 –0.5
AUX_GPIO4-7 –0.5
AUX_RXD –25V
d
AUX_TXD –10
Analogue signals
DC output range:
RSSI 0
13V8_SW 9.7
DC bias:
AUD_TAP_IN 1.4
AUD_TAP_OUT 2.1
AUX_MIC_AUD 2.9
Input impedance:
AUD_TAP_IN 50
AUX_MIC_AUD 2.1
Output impedance:
AUD_TAP_OUT 590
RSSI 950
Safe DC input limits:
AUD_TAP_IN –17
d
AUD_TAP_OUT –0.5
AUX_MIC_AUD –17
d
RSSI –17
a. For more information on hardware links refer to
b. It is recommended that this input is driven by a mechanical switch or an open collector/drain output.
c. For more information on pullups refer to
d. These outputs are protected against accidental input to the limits specified.
22 Description of the Radio Interfaces
Standard
typ. max. units
0.7 V
V –4 V
s
V
–1.5 V
V
–100 –120 µA
b
–13 mA
–500 µA
–1 mA
1 mA
10 µA
100 µA
50 mV
600 mV
200 mV
V
V
V +0.5 V
s
V +0.5 V
s
V +0.5 V
s
V +0.5 V
s
3 V
17.2 V
1.5 1.6 V
2.3 2.5 V
3.0 3.1 V
100 150 kΩ
2.2 2.3 kΩ
Ω
600 650
Ω
1000 1050
+17 V
+17 V
+17 V
+17 V
"Digital Input Lines" on page
Test method and conditions
a
No hardware links fitted
LK3 fitted.
a
No hardware links fitted
LK3 fitted.
LK1 and/or 2 fitted.
a
No links fitted . Default pullups
LK3 fitted. V =13.8V
s
LK1 and 2 fitted.
–8V input.
a
No links fitted . Default pullups
+8V input.
3.3V input.
5V input.
100!A sink current.
10mA sink current.
100!A sink current.
c
No load. Default pullups
3kΩ load.
See Table 2.9 on page 24.
Follows V .
s
No load. Zero Rx frequency error.
Via 2.2kΩ.
DC to 10kHz
DC to 10kHz
"Power Sense Options" on page
39.
TM8000 3DK Hardware Developer's Kit Application Manual
Comments
. Includes AUX_GPI3 with LK1/2 fitted.
Configured as emergency power sense
input.
.
Configured as emergency power sense
input.
Configured as power sense input.
c
. Default pullup resistance is 33kΩ.
Configured as emerg. power sense input.
Configured as power sense input.
c
. Default pullup resistance is 33kΩ.
Current limit occurs at 20mA typ.
.
Input current must not exceed
This is the rating of the clamping
diodes.
Output switches off outside this range.
Bias for electret microphone.
Short circuit-safe. Input current <
121.
September 2003 © Tait Electronics Ltd
±
50mA.
±
20mA