LM77-3EVAL National Semiconductor, LM77-3EVAL Datasheet - Page 2

• Manufacturer Part Number: LM77-3EVAL
• Description: EVALUATION BOARD FOR LM77-3
• Manufacturer: National Semiconductor

Specifications of LM77-3EVAL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM77-3EVAL

N
3.0 LM77 Evaluation Board Schematic
The LM77 Demo Board schematic is shown at the end of this document. The software was pre-configured
to run with all of the jumpers installed.
Table 1 Jumper Functions
Jumper
JP1
JP2
JP3
JP4
JP5
The LM77 comes with shorting bars across 2 pin headers JP2, JP3, JP4, JP5.
Table 2 JP1 Description
Pin Number
1
2
3
4
5
6
7
8
4.0 LM77 Evaluation Board Bill of Materials
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
NOTE, TH = Through hole
Copyright © July 1999 National Semiconductor
Connect the board to the parallel printer port of the PC directly or through a cable not longer than 3
feet.
Press the ON button on the screen. The software will then report the state of all the registers in the
LM77.
Qty
2
1
2
1
2
1
4
1
3
2
1
1
4
Reference
C1, CB
CA
D1, D2
D3
D4, D5
JP1
JP2, JP3, JP4, JP5
P1
R1, R4, R5
R2, R3
U1
U2
JP2, JP3, JP4, JP5
Description
SDA
SCL
Lable OS on Board but maps to T_CRIT_A pin on LM77
GND
A1
A0
INT
+Vs
Function
Mapped to the corresponding pin on the LM77 (see Table 2)
Monitoring LED connection to pin OS/T_CRIT_A pin when short is
installed.
Connects A0 to logic 0 when short is installed; connects A0 to logic 1
when short is not present.
Connects A1 to logic 0 when short is installed; connects A1 to logic 1
when short is not present.
Monitoring LED connection to INT pin when short is installed.
2/2
HEADER 8X1, TH
Description
0.1 uF, 0805, 25V, +80%-20%
10 uF, 1206
1N5817 or 1N5712,TH
1N5817 or 1N5712,TH
RED LED, HLMP K150, TH
HEADER 2X1, TH
DB25, MALE, RIGHT ANGLE
2K, 1/8 W, 0805, 5%
100K, 1/8 W, 0805, 5%
LP2950CZ-3.3, TH
LM77
JUMPERS
LM77 Evaluation Kit