Tait TP9100, Service Manual, Page: 310 / 326

310 TPA-AA-201 Accessory Connector Kit
TP9100 Service Manual
© Tait Electronics Limited May 2005
5. Modify the components on the accessory connector PCB as follows
(refer to
Figure 16.1 ). Note that some components may already be
fitted by default.
■
For all accessories with differential speaker (not referenced to
ground), fit a 0
Ω
link (1206) at position C1 instead of the fitted
0
Ω
link (1206).
■
For all accessories with a single-ended speaker (referenced to
ground), fit a 4.7µF capacitor (ceramic, 1206, X7R, 16 V) at
position C1.
■
To disable the radio’s internal speaker, fit a 0
Ω
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 0
Ω
(0603) link at position
R4.
■
To enable an external function button, fit a 12k
Ω
resistor
(0603, 1/10W ±5%) at position R1.
6. Reassemble the kit as described in “Disassembly and Reassembly” on
page 312 .
Table 16.1 Accessory connector – pads and signals
Signal name Pad Description Signal type Signal level
Output
impedance/
current
Input
impedance
AUD TAP OUT P8 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 600
Ω
)
600
Ω
–
AUD TAP IN P9 Programmable tap point into
the Rx or Tx audio chain,
DC-coupled Analog audio 0.69V
pp
for 60%
deviation at 1kHz
(–10dBm into 600
Ω
)
– 100k
Ω
DC to
100kHz
ACC PWR P10 Accessory power DC supply 3.3V nominal 100mA (max) –
ACC RXD P11 Serial receive data 3V3 CMOS high = 0
low = 1 – –
ACC TXD P12 Serial transmit data 3V3 CMOS high = 0
low = 1 1mA (max) –
ACC GPIO1 P13 Accessory sense (internal
speaker disable) 3V3 CMOS high = 1
low = 0 1mA (max) –
ACC GPIO2 P14 Accessory sense 3V3 CMOS high = 1
low = 0 1mA (max) –
ACC MIC P1 External microphone input
(electret)
Dynamic microphones are not
supported. Analog audio 9.5V
rms
for 60%
modulation at 1kHz,
DC-coupled
– 2.2k
Ω
GND P2 Analog ground Ground – – –
ACC PTT P3 External press-to-talk input Analog DC 0 to 2.5V, PTT=0 – 27k
Ω
ACC SPKR– P6 External speaker differential
output Analog audio +6.5V
pp
a
differential To drive 16
Ω
differentially
–
ACC SPKR+ P7 External speaker differential
output Analog audio +6.5V
pp
a
differential To drive 16
Ω
differentially
–
a. Dependent on battery charge level.