Motorola APX 6000 Service Manual

3-50 Theory of Operation: Controller
3.2.6.3.3 Secondary Lighting Controller – SRX 2200
Figure 3-35
shows the major connection scheme to this secondary lighting controller exclusively for SRX 2200.
A lighting system has been put into place to accommodate night profiles. These profiles shift both
displays and the keypad to a lower brightness. The LM27965 Lighting Controller, which controls the
Front Display and Keypad during normal operation, is disabled during Night Operation/ Night Vision
operation. The LM3943 is the only operating backlight driver during this mode and lower brightness
levels are achieved by routing separate lines and decreasing the duty cycle of its pulse width
modulated signal.
Figure 3-35. Lighting Controller – SRX 2200
RADIO TOP LIGHTING
V_EXT_1.85 V_LED_TOP
C2201
C2202
R2201
0.1UF
0.1UF
200K
SCL2
EN
GND
SDA1
SCL1
SDA2
7
2
54
63
1
8
U2202
V_EXT_1.85
SCL_5V
SDA_5VI2C_DATA
PCA9306
I2C_CLK
IC2_TRANS_VREF2
VREF1 VREF2
R2243
V_LED_TOP
10K
OMAP_RESET_5V
C2221
1
3
2
Q2202
DNP
0.1UF
DTC114YKAF
OMAP_RESET
47K
10K
LED DRIVERS
R2235
V_SW_5 V_LED_TOP
0
R2206
R2204
C2203
R2207
V_LED_TOP
V_LED_TOP
3.3K
0.1UF
0
3.3K
LED15
GND2
GND1
SCL
RST
SDA
A0
A1
A2
LED12
LED11
LED10
LED9
LED8
LED13
LED7
LED6
VDD
LED14
LED0
LED1
LED2
LED3
LED4
LED5
21
20
19
18
11
10
8
7
6
5
4
3
17
16
15
14
13
12
2
1
25
9
24
23
22
U2201
LP3943
4 KEYPAD
NV PROFILE ALTERNATE
CURRENT DRAIN PATHS
3 FRONT DISPLAY
2 TOP DISPLAY (RED & WHITE)
TX_RX_GREEN_LED
KP_LED4_NVG
KP_LED3_NVG
TX_RX_AMBER_LED
TOP_DISP_WHITE_LED
TOP_DISP_NVG_W
TX_RX_RED_LED
KP_LED2_NVG
KP_LED1_NVG
F_DISP_LED3_NVG
F_DISP_LED2_NVG
F_DISP_LED1_NVG
TOP_DISP_NVG_R
TOP_DISP_GREEN_LED
TOP_DISP_RED_LED
R2262
R2261
R2260
R2259
R2258
R2257
R2256
R2255
R2247
R2215
11K
430
82K
7.5K
7.5K
7.5K
11K
11K
11K
11K
C2220
R2241
V_LED_FRONT
1UF
0
FRONT DISPLAY AND KEYPAD LIGHTING
NC
NC
NC
23
11
8
12
13
6
14
5
15
3
4
16
KP_LED3
KP_LED2
F_DISP_LED1_RETURN
KP_LED4
KP_LED1
F_DISP_LED3_RETURN
F_DISP_LED2_RETURN
U2204
LM27965
VIN
RESET
ISET
C1_P
C1_N
C2_P
C2_N
VIO
CTGND GND1
GND2
SDIO
SCL
NC
NC
NC
NC
7
24
2
1
10
17
20
21
19
22
I2C_CLK
OMAP_RESET
I2C_DATA
IN
IO
D1A
D1B
D2B
D1C
D3B
NC1
NC2
D2A
D3A
D4A
D5A
POUT
18
9
G1
R2242
V_SW_3.60
0
C2217
1UF
R2245
U2205
V_EXT_1.85
2SC5663
12.4K
F_DISP_AND_KP_ISET
R2244
2
3
1
V_LED_TOP
10K
ISET SWITCH
LED 7 ON = NV MODE
LED 7 OFF = DEFAULT MODE
F_DISP_KP_NVG_MODE

Motorola APX 6000 Specifications

General

Brand	Motorola
Model	APX 6000
Category	Two-Way Radio
Language	English