Midian Encryption Programming and Service Manual TM8000 Encryption 49
June 2006 © Tait Electronics Limited
Q1 to Q5 are level translators for interfacing between the TM8000 3V3
logic on GPIO (pins 3 to 7) and the module’s 5V logic. Q1, Q2, Q4 and
Q5 are on the code space lines and Q3 is on the Mode line.
Wake-up Circuit
Comparator circuitry U2 and associated components provides a wake-up
signal for modules with a low current (sleep) mode. This signal is derived
from RSSI voltage exceeding a fixed level (set by R13 and R18). U5 acts as
an inverter and the wake-up circuit links to the module via Link 1 (1-2). See
“Link Setting” on page 51 for more information.
RS232 Buffer (future development)
U3 and associated components provide an RS232 buffer for module
programming.
Filtering
All signals passed through SK1 are filtered by FL1 through to FL4.
Alternate functions
As Midian TVS-2 modules only require a two-bit code, GPIO6 and GPIO7
are available for alternate functions via Links 7 through 10. (Note: links are
normally set for GPIO6 and GPIO7 to CS4 and CS8).
SK102 Functions for
GPIO6 and GPIO7
IOP_GPIO6 CS4 / WAKEUP / INDICATOR FROM MODULE
IOP_GPIO7 CS8 / WAKEUP / INDICATOR FROM MODULE
TM8000 Internal Options connector (SK102) 18way Micromatch Socket
Pin Signal Description Signal Type Levels Conditions
1 13V8_SW Switched 13.8v supply (switched) Power 13.8V
2 AUD_TAP_OUT Programmable TAP OUT, DC coupled Analogue 0.69Vp-p 600 ohms
3 AGND Analogue ground Ground
4 AUX_MIC_AUD Auxiliary microphone input (electret bias) Analogue 7.5 mV 3.0 V Bias
5 RX_BEEP_IN Receive sidetone Input, AC coupled Analogue 0.76Vp-p 10 K ohms
6 AUD_TAP_IN Programmable TAP IN, DC coupled Analogue 0.69Vp-p 600 ohms
7 RX_AUD Receive audio output post Vol, AC coupled Analogue 1.0 Vp-p 100 ohms
8 RSSI Analogue RSSI output Analogue .5-2.5 Vdc 1000 ohms
9 IOP_GPI01 Programmable Port, PTT OUT Digital 3.3 V CMOS
10 IOP_GPI02 Programmable Port, PTT IN Digital 3.3 V CMOS
11 IOP_GPI03 Programmable Port, Encry Mode ON / OFF Digital 3.3 V CMOS
12 IOP_GPI04 Programmable Port, CS 1 Digital 3.3 V CMOS
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