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PWR KEY
(
NELL#H2)
keyrow(0:5)
(NELL#J4-K4)
Address Bus
6.5.4 SIM Interface
The SIM interface includes a voltage level shifting circuit, which allows the
DB2000 to operate with both 3 and 5 volt SIMs.The SIM interface is managed by
NELL via five control signals:
1. SIMPWR (NELL#L5)
This output from NELL connects to MiniMoe (IC19) #20. A logic high
switches the output SIMVCC (#1) to on, and supplies power to the SIM
connector(#6).
2. SIMRST (NELL#P5)
This output connects to the SIM connector (#2). It provides a reset function
on the SIM card when performing data operations.
SIM Data (NELL#N5)
SIM CLK (NELL#M5)
SIM RST (NELL#P5)
keycol(0:3)
(NELL#H4-J3)
BOOK
1
4
7
*
LCD PWR
(NELLl#N3)
LCD_CS
(NELL#N3)
(NELL#C6-C12)
Data Bus
(NELL#A4-G2)
Figure.10d: KeyPad, Display and SIM Interface
SIMVCC
SIM
CLR
3 SEND
2
6
5
8
9
0
#
LCD
96 x 32
Pixel
Graphical Display Module
backlight enable
(NELL#C3)
Green Led
(NELL#B6)
up
Red Led
down
(NELL#D6)
+3VNELL
backlight
+3VNELL
GRN
LED
+3VNELL
RED
LED
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