Serial Interface And Pc Port Pin Out; Trf4900 Evm Serial Interface - Texas Instruments TRF4900 User Manual

2.4 Serial Interface and PC Port Pin Out

Figure 2−2 details the serial interface portion of the TRF4900 EVM.
Figure 2−2. TRF4900 EVM Serial Interface
P1
1
14
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9 R19 R20 R21
22
10k 10k 10k
10
23
11
24
12
25
13
DB25M
P1 Computer Interface Connector Pin Number
2
3
4
5
7
9
18 thru 25
C14
LOCKDET
0.1uF
IC2 20
1
1OE
2 18
1A1 1Y1
4 16
1A2 1Y2
6 14
1A3 1Y3
8 12
1A4 1Y4
19
2OE
11 9
2A1 2Y1
13 7
2A2 2Y2
15 5
2A3 2Y3
17 3
2A4 2Y4
10
R22 R23 R24
R25
10k 10k 10k
SN74LVT244BDW 510
LED2
TXDATA
ENABLE
LN1471SY−(TR)
Serial Interface and PC Port Pin Out
DATA
R12
100
CLOCK
R13
100
STROBE
R14
100
R15
R18
10k
510
LED1
LDET
LN1371SG−(TR)
CR1
LL4148
CR2
LL4148
CR3
LL4148
CR4
R26 R27
STDBY MODE
100 100
LL4148
JP2 JP3
2 2
3 1 3 1
Function
DATA
CLOCK
STROBE
MODE
STDBY
TXDATA
Ground
Evaluation Board
DATA
CLOCK
STROBE
R16 R17
10k 10k
MODE
STDBY
TXDATA
R28 R29 R30
10k 10k 10k
2-11