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5. Connect the power supply.
Hook up the connector from the wall transformer to header J5 on the Prototyping Board as
shown in Figure 4. The orientation of this connector is not important since the VIN (posi-
tive) voltage is the middle pin, and GND is available on both ends of the three-pin header
J5.
NOTE: Do not connect the AC adapter to the VBAT terminal on the Prototyping Board.
The VBAT terminal supplies the backup battery voltage of 3 V, and the LP3500 may be
damaged if subjected to the raw DC voltage from the AC adapter through the VBAT
terminal.
6. Apply power.
Plug in the AC adapter. If you are using your own power supply, it must provide 3 V to
30 V DC—voltages outside this range could damage the LP3500.
NOTE: A hardware reset may be done by pressing the RESET switch on the LP3500.
The LP3500 may also be reset by unplugging the AC adapter, then plugging it back in.
However, when the LP3500 is operating in the power-save mode, the backup battery
will provide sufficient voltage to prevent a reset from happening, in which case you will
have to press the RESET switch on the LP3500.
C16
U1
C36
C19
RN2
D18
D21
C48
C20
U3
C22
D5
D13
BT1
D7
D2
D4
Q22
D8
R30
C10
C13
RN1
R13
R6
R16
R7
Y1
R9
C26
C33
D1
R32
R20 R25
J3
R1
R26
R22
AIN0 AIN1 AIN2 AIN3
AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 GND
Reset switches are located on both sides of the LP3500 board.
12
J8
RELAY
D25
Q10
Q16
Q17
R43
K1
R33
Q6
Q13
D32
Y2
Q12
C51
C67
U12
C55 R44
R47
U8
Q14
D33
J6
U11
R48
U10
U9
RP13
S1
C65
R58
C50 R36 R40 C54
Q20
RESET
R50
R54
R49
J5
D22
J2
PROGRAM
PORT
VBAT
GND
EXT GND VIN GND
GND
switch
Figure 5. Locations of LP3500 RESET Switches
D31
D29
D27
D24
Q3
D23
Q15
Q11
Q7
RP12
RP10
RP11
D6
D7
TP1
Q21
U5
D5
D4
VRAM
D2
D3
J6
D0
D1
R46
A1
A0
A3
A2
GND
GND
GND
R52
R53
U6
S2
C52
Q18
Q19
RESET
RESET
U7
U7
–VDISP–
TP2
TP2
/RESET
/RESET
PROGRAM
PORT
PROGRAM
PORT
VBAT
EXT
switch
R35
Q4
8–15 0–7 IN
U4
C25
IN00
R10
R2
+K
GND
R11
R3
D14
IN01
VCC
R12
R4
IN02
C28
IN03
D16
RP3
C30
IN04
RP4
IN05
IN06
D12
D10
IN07
GND
D6
C1
C4
IN08
C23
C17
IN09
C71
U2
RP2
IN10
IN11
JP13
D9
RP1
C21
C14
C9
IN12
R14
R5
IN13
R8
IN14
R15
4–20 mA
C34
C27
D3
IN15
R19
R28
C38
R21
R27
Fox (LP3500)
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