314 TPA-AA-202 Accessory Cable Kit TP9100 Service Manual
© Tait Electronics Limited May 2005
5. Modify the components on the accessory connector PCB as follows
(refer to Figure 17.1). Note that some components may already be
fitted by default.
■ For all accessories with differential speaker (not referenced to
ground), fit a 0Ω link (1206) at position C1.
■ For all accessories with a single-ended speaker (referenced to
ground), fit a 4.7µF capacitor (ceramic, 1206, X7R, 16V) at
position C1 instead of the fitted 0Ω link (1206).
■ To disable the radio’s internal speaker, fit a 0Ω link (0603) at
position R3.
■ When using an external switch to control the ACC PTT line, for
example in a hands-free vehicle kit, fit a 0Ω (0603) link at position
R4.
■ To enable an external function button, fit a 12kΩ resistor
(0603, 1/10W±5%) at position R1.
6. Reassemble the kit as described in “Disassembly and Reassembly” on
page 316.
Table 17.1 Accessory cable – wires and signals
Signal name Wire Description Signal type Signal level
Output
impedance/
current
Input
impedance
AUD TAP OUT white/
blue stripe
Programmable tap point
out of the Rx or Tx audio
chain, DC-coupled
Analog audio 0.69V
pp
for 60%
deviation at 1kHz
(–10dBm into 600Ω)
600Ω –
AUD TAP IN blue Programmable tap point
into the Rx or Tx audio
chain, DC-coupled
Analog audio 0.69V
pp
for 60%
deviation at 1kHz
(–10dBm into 600Ω)
– 100kΩ
DC to
100kHz
ACC PWR brown Accessory power DC supply 3.3V nominal 100 mA (max) –
ACC RXD yellow Serial receive data 3V3 CMOS high = 0
low = 1
––
ACC TXD green Serial transmit data 3V3 CMOS high = 0
low = 1
1mA (max) –
ACC GPIO1 violet Accessory sense (internal
speaker disable)
3V3 CMOS high = 1
low = 0
1mA (max) –
ACC GPIO2 white/
red stripe
Accessory sense 3V3 CMOS high = 1
low = 0
1mA (max) –
ACC MIC orange External microphone
input (electret)
Dynamic microphones
are not supported.
Analog audio 9.5V
rms
for 60%
modulation at 1kHz,
DC-coupled
–2.2kΩ
GND black Analog ground Ground – – –
ACC PTT gray External press-to-talk
input
Analog DC 0 to 2.5V, PTT=0 – 27kΩ
ACC SPKR– white External speaker
differential output
Analog audio +6.5V
pp
a
differential To drive 16Ω
differentially
–
ACC SPKR+ red External speaker
differential output
Analog audio +6.5V
pp
a
differential To drive 16Ω
differentially
–
a. Dependent on battery charge level.
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