17
/
50
The following figure shows a reference design of power supply. The precision of resistor R2 and R3 is 1%,
and the capacitor C3 needs a low ESR.
LDO_IN
C1
C2
MIC29302WU
U1
IN
OUT
E
N
G
N
D
A
D
J
2
4
1
3
5
VCC
100nF
C3
470uF
C4
100nF
R2
82K 1%
47K 1%
R3
470uF
470R
51K
R4
R1
MCU_POWER
_ON/OFF
47K
4.7K
R5
R6
C5
C6
33pF
10pF
TVS
D1
Figure 3: Reference Design of Power Supply
3.4.
(U)SIM Card Interfaces
The following table shows the pin definition of (U)SIM card interfaces.
Table 6: (U)SIM Pin Definition
EP06 supports 1.8V and 3.0V (U)SIM cards.
The following figure shows a reference design for a 6-pin
(U)SIM card connector.
Pin No.
Pin Name
I/O
Power Domain
Description
8,13
USIM_VDD
USIM2_VDD
PO
1.8V/3.0V
Power source for the (USIM) card
10,19
USIM_DATA
USIM2_DATA
IO
1.8V/3.0V
(U)SIM data signal
12,17
USIM_CLK
USIM2_CLK
DO
1.8V/3.0V
(U)SIM clock signal
14,7
USIM_RST
USIM2_RST
DO
1.8V/3.0V
(U)SIM reset signal
