Pin No.
Pin Name
I/O
Description
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
XOUT
XIN
TEST
NC
PAGE KEY
DTMF 5
DTMF 4
DTMF 3
DTMF 2
DTMF 1
DTMF 0
OUT RANGE
L SEIZE
100/600
SIG OUT
VSS
BAND
Frequency 1
COMBO CLK
COMBO DATA
COMBO STB
TX PWR
TX DATA
M/B
INUSE/CHG LED
ANT LED
T/P SW
RX DATA
CHG DET
RING DET
RESET
VDD
O
I
I
I
I
O
O
O
O
O
I/O
I/O
I
—
I/O
O
O
O
O
I/O
O
O
I
I
I
I
I
—
Resonator out (4.0 MHz)
Resonator in (4.0 MHz)
Tied low
Not connected
PAGE Key 1 = PAGE ON, 0 = Standby
DTMF DATA 5
DTMF DATA 4
DTMF DATA 3
DTMF DATA 2
DTMF DATA 1
DTMF DATA 0
Normaly High (Pull up)
Line Seize 1 = Line Seize
Flush Time select 1 = 100ms, 0 = 600ms
Received Signal Strength Indicator
0 = Carrier present, 1 = Carrier absent
0 = RX unlock, 1 = RX lock
0 = TX unlock, 1 = TX lock
Ground
Shunt capacitor frequency high band 1 = Shunt
1 = 25CH, 0 = 10CH
Combo chip CLOCK
Combo chip DATA
Combo chip STB
TX Power control 0 = ON, 1 = OFF
Transmitted DATA
Make Break rate select 1 = 33.3%, 0 = 40.0%
INUSE/CHG LED 0 = ON
ANT LED 0 = ON
T/P SW input 1 = Pulse, 0 = Tone
Received DATA
Charger detect 0 = Charging, 1 = Not charging
Ringer detect 0 = Ring
Normaly High, low to reset MCU
Power (VDD)
IC, TMP87C408M
IC DESCRIPTION
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