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15.2. CPU Data (Handset)
15.2.1. IC1 (BBIC)
PIN Description
I/O
1
Key Scan
D.I
2
Digital IO Source
VDD
2.5V
3
Digital Power
VDD
Source 1.8V
4
Digital GND
DGN
D
5
EEPROM Write
D.O
Protect
6
LCD Register
D.O
Select
7
LED Control
D.O LED_OFF
8
Regulator Control
D.O
9
LCD Serial Data
D.O
10 LCD Serial Clock
D.O
11 LCD Reset
D.O
12 Key Scan
D.I
13 Analog (TDO,
+1.8
RSSI, FDA)
V
Source 1.8V
14 Analog GND (AVD) AGN
D
15 Xtal Freq Adjust
D.I
16 Xtal: 10.368 MHz
D.I
Input
17 GND (RFCLK, Xtal
GND
oscillator)
18 NC
O
19 RSSI input
A.I
20 RFCLK Xtal oscil-
+1.8
lator Source 1.8V
V
21 RF CLK OUT
D.O
22 RF TX DATA
D.O
23 RF RX DATA
D.I
24 RF SCLK
D.O
25 RF SDATA
D.O
26 RF LOAD EN
D.O
27 Key Scan
D.O
28 SP-AMP Mute con-
D.O
trol
29 GND (CLASSD
GND
power amplifier)
30 CLASSD positive
A.O
output
31 CLASSD audio
VBA
amplifier Source
T
32 CLASSD negative
A.O
output
33 GND (CLASSD
GND
power amplifier)
34 RF TXRX switch
D.O
35 RF PA ON/OFF
D.O
SW
36 LCD(KEY)LED
D.O
control
37 Digital GND
DGN
D
38 Digital IO Source
+2.5
2.5V
V
39 Digital Source 1.8V +1.8
V
40 Key Scan
D.I
High
High_Z
Low
Non
key in
I-PU
-
-
-
-
-
-
-
-
-
Write
Read
I-PU
enable
Data
Instruction
I-PU
LED_ON
I
ON
OFF
I-PD
*
-
I
*
-
I
L
Reset
O-1
Non
key in
I-PU
-
-
-
-
-
-
-
-
I
-
-
I
-
-
-
-
-
Hi-Z + PU
-
-
Hi-Z + PU
-
-
-
*
*
O-0
*
*
*
*
I
*
*
O-0
*
*
I-PD
*
*
O-0
Non
key in
I-PD
Mute
I-PD
-
-
-
*
*
O
-
-
-
*
*
O
*
*
-
TX
RX
I-PD
ON
OFF
I-PD
ON
OFF
I-PD
-
-
-
-
-
-
-
-
-
Non
key in
I-PU
PIN Description
41 Mode control/
UART TX data
42 UART RX data
43 Mode control/JTAG
i/f
44 EEPROM Serial
Data
45 EEPROM Serial
Clock
46 Key Scan
47 Key Scan
48 Key Scan
49 Digital GND
50 Digital IO Source
1.8V
51 NC
52 Charger Detect
53 Reset
54 DC/DC converter
filter output
55 DC control current
sense input
56 Switching clock for
the DC/DC
57 Sensor input for
DC/DC
58 VBAT voltage
monitor
59 Regulator 1 con-
trol output
60 Regulator 2 con-
trol output
61 Power ON
62 Charge control
63 Low drop regula-
tor 1 sense input.
64 Analog GND
(AVD2)
65 Analog Power
source 1.8V
66 Receiver output
(Negative)/(SP-
out)
67 Receiver output
(Positive)
68 MIC in (Negative)
69 MIC Refer-
ence(Negative)
70 Voltage reference
1.5V
71 Signal ground 0.9V A.O
72 MIC in (Positive)
73 MIC BIAS(Posi-
tive)
74 Key Scan
75 Key Scan
76 Key Scan
77 LCD Chip Select
78 Sense input for
ADC3.
75
KX-TG2853BXS/KX-TG2854BXS/KX-TGA280BXS
I/O
High
High_Z
D.O
RST↑:
RST↑:
usually
Boot mode
mode
D.I
*
*
D.I
RST↑:
RST↑:
usually
Debug
mode
mode
D.O
*
*
D.O
*
*
D.O
Non
key in
D.O
Non
key in
D.O
Non
key in
DGN
-
-
D
+1.8
-
-
V
D.I
-
-
D.I
Charger
No Cagier
on
D.I
-
-
D.O
-
-
D.I
-
-
D.O
-
-
D.I
-
-
A.I
A/D
A/D
D.O
Active
-
D.O
Active
-
D.I
Active
-
D.O
Stop
Charge On
D.I
-
-
AGN
-
-
D
+1.8
-
-
V
A.O
Analog
Analog
A.O
Analog
Analog
A.I
Analog
Analog
A.O
-
-
A.O
-
-
-
-
A.I
Analog
Analog
A.O
-
-
D.O
Non
key in
D.I
Non
key in
D.I
Non
key in
D.O
Disable
Enable
A.I
-
-
Low
I-PU
I-PU
I-PU
I-PU
I-PU
I-PU
I-PU
I-PU
-
-
I
I-PD
I-PU
O
I
O-PD
I
I
O-1
O-0
I-PD
O-0
I
-
-
O
O
I
O
O
O
I
I-PD
I
I
I-PD
I
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Troubleshooting
