Power-Control Ic (Pcic) U104; Table 4-3. Power Control Ic (U104) Pin Descriptions - Motorola ASTRO XTS 5000 Detailed Service Manual

Detailed Theory of Operation: Transceiver Board

4.2.4.9 Power-Control IC (PCIC) U104

The PCIC, U104, contains all of the digital, and most of the analog, circuits needed to control the
transmitter power amplifier. Host control is through a 3-wire, smart SPI interface. Pin descriptions are
shown in Table
Pin
1
2
3
4
5
6, 7
8
9
10, 13
11, 12
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
68P81094C31-O
4-3.

Table 4-3. Power Control IC (U104) Pin Descriptions

Name
RFIN Detector voltage input to ALC
T1 Test point
CI External capacitor for integrator time constant
INT Integrator output; control voltage to amplifiers
CJ External capacitor for PA rise and fall times
VL, CL External capacitor for PA rise and fall times
GND1 Ground
F168 Reference clock input, 2.1 MHz
QX, CQX External capacitor for voltage multiplier
Q, CQ External capacitor for voltage multiplier
V10 Voltage multiplier output
VG Internal band-gap reference voltage
V45 Regulated 4.5 Vdc output
V5EXT Power supply input for internal voltage regulator
VAR2 Buffered D/A output
VLIM Test point for internal D/A No.2 voltage
VAR1 Buffered D/A output
RS Asynchronous reset input
NA Spare pin
RX RX/TX mode control-bit output
VAR3 Buffered D/A output
GND2 Ground
CLK SPI clock input
BPOS Power supply input
DATA SPI data input/output
CEX SPI chip select input
TEMP Temperature sensor input
RSET External resistor; used to set the temperature cutback rate
ANO Switched BPOS output
Description
4-7
April 15, 2002