LG B2050 Service Manual - Page 27

D. SIM interface, E. Key interface, F. AD6537B Interrupt - charger

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3. TECHNICAL BRIEF D. SIM interface The AD6527 provides SIM Interface Module. The AD6527 checks status periodically during established call mode whether SIM card is inserted or not, but it doesn't check during deepSleep mode. In order to communicate with SIM card, 3 signals SIM_DATA, SIM_CLK,SIM_RST(GPIO_23) are required. The descriptions about the signals are given by bellow Table 3-6 in detail. Signals LCD_DATA LCD_CLK SIM_RST (GPIO_23) Description This pin receives and sends data to SIM card. This model can support only 3.0 volt interface SIM card. Clock 3.25MHz frequency. Reset SIM block Table 3-6 SIM CONTRON SIGNALS DISCRIPTION 2V85_VSIM 2V85_VSIM SIM_DATA R336 20K R337 0 J300 4 5 6 10 9 OND1 VPP IO OND5 OND4 VCC RST CLK OND2 OND3 1 2 3 7 8 C314 NA R338 0 SIM_RST SIM_CLK C315 C316 C317 220n 1000p NA Figure 3-9 SIM Interface of AD6527 E. Key interface Include 5 column, 5 row and additional GPIO 35 for KEY_ROW5. The AD6527 detects whether key is pressed or not by using interrupt method. F. AD6537B Interrupt AD6537B provides an active-high interrupt output signal. Interrupt signals are generated by the Auxiliary ADC, audio, and charger modules. - 26 -

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3. TECHNICAL BRIEF
- 26 -
D. SIM interface
The AD6527 provides SIM Interface Module. The AD6527 checks status periodically during
established call mode whether SIM card is inserted or not, but it doesn't check during
deepSleep mode. In order to communicate with SIM card, 3 signals SIM_DATA,
SIM_CLK,SIM_RST(GPIO_23)
are required. The descriptions about the signals are given by bellow Table 3-6 in detail.
Signals
Description
LCD_DATA
LCD_CLK
SIM_RST
(GPIO_23)
This pin receives and sends data to SIM card.
This model can support only 3.0 volt interface SIM card.
Clock 3.25MHz frequency.
Reset SIM block
Table 3-6 SIM CONTRON SIGNALS DISCRIPTION
Figure 3-9 SIM Interface of AD6527
1
2
3
7
8
4
5
6
10
9
SIM_DATA
2V85_VSIM
OND1
R336
20K
R337
R338
J300
VPP
IO
OND5
OND4
VCC
RST
CLK
OND2
OND3
2V85_VSIM
SIM_RST
SIM_CLK
C315
C314
NA
0
0
NA
220n
1000p
C316
C317
E. Key interface
Include 5 column, 5 row and additional GPIO 35 for KEY_ROW5. The AD6527 detects
whether key is pressed or not by using interrupt method.
F. AD6537B Interrupt
AD6537B provides an active-high interrupt output signal. Interrupt signals are generated by
the Auxiliary ADC, audio, and charger modules.