Figure 3-35. Lighting Controller - Srx 2200 - Motorola APX 5000 Service Manual

3-50
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.
V_EXT_1.85
C2201
0.1UF
U2202
PCA9306
I2C_CLK
I2C_DATA
LED DRIVERS
F_DISP_KP_NVG_MODE
ISET SWITCH
LED 7 ON = NV MODE
LED 7 OFF = DEFAULT MODE
V_LED_TOP V_SW_5
R2235
0
R2201
200K
C2202
0.1UF
IC2_TRANS_VREF2
8
EN
3 6 SCL_5V
SCL1 SCL2
4 5 SDA_5V
SDA1 SDA2
V_EXT_1.85 V_LED_TOP
R2243
Q2202
10K
DTC114YKAF
3 OMAP_RESET_5V
10K
2
47K
C2221
0.1UF
DNP
1
OMAP_RESET
V_SW_3.60
C2217
1UF
V_LED_TOP
F_DISP_AND_KP_ISET
V_EXT_1.85
R2245
12.4K
R2244
10K
U2205
1
2SC5663
FRONT DISPLAY AND KEYPAD LIGHTING
Figure 3-35. Lighting Controller – SRX 2200
RADIO TOP LIGHTING
V_LED_TOP
V_LED_TOP
V_LED_TOP
R2207
0
R2206
R2204 C2203
U2201
3.3K 3.3K
0.1UF
LP3943
19 1
SCL LED0
18 2
RST LED1
20 3
SDA LED2
22 4
A0 LED3
23 5
A1 LED4
24 6
A2 LED5
7
LED6
8
LED7
10
LED8
11
LED9
12
LED10
13
LED11
14
LED12
15
LED13
16
LED14
17
LED15
R2242
0
U2204
LM27965
I2C_CLK 1
SCL
IN
24
VIN
OMAP_RESET 10
RESET
17
ISET
2
SDIO
7
VIO
I2C_DATA
IO
19
NC C1_P
22
NC C1_N
20
NC C2_P
21
NC C2_N
Theory of Operation
TOP_DISP_RED_LED
TOP_DISP_GREEN_LED
TOP_DISP_WHITE_LED
TOP_DISP_NVG_W
R2247
82K
TX_RX_RED_LED
TX_RX_GREEN_LED
TX_RX_AMBER_LED R2215
430
TOP_DISP_NVG_R R2255 11K
F_DISP_LED1_NVG R2256 7.5K
F_DISP_LED2_NVG R2257 7.5K
F_DISP_LED3_NVG R2258 7.5K
KP_LED1_NVG R2259 11K
KP_LED2_NVG R2260 11K
KP_LED3_NVG R2261 11K
KP_LED4_NVG R2262 11K
NV PROFILE ALTERNATE
CURRENT DRAIN PATHS
4 KEYPAD
3 FRONT DISPLAY
2 TOP DISPLAY (RED & WHITE)
23
POUT
16 KP_LED1
D1A
15 KP_LED2
D2A
14 KP_LED3
D3A
13 KP_LED4
D4A
12
D5A
4 F_DISP_LED1_RETURN
D1B
5 F_DISP_LED2_RETURN
D2B
6 F_DISP_LED3_RETURN
D3B
3
NC
D1C
8
NC
NC1
11
NC
NC2
: Controller
V_LED_FRONT
R2241
0
C2220
1UF