Datasheet

ST7540 Pin settings
5/44
2 Pin settings
2.1 Pin connection
Figure 2. Pin connection (top view)
2.2 Pin description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
CD_PD
REG_DATA
GND
RxD
RxTx
TxD
BU/THERM
CLR/T
V
DD
MCLK
RSTO
UART/SPI
WD
PA_IN-
TEST2
TEST1
VDC
RX_IN
CL
Vsense
X2
X1_OSCIN
SV
SS
TX_OUT
PA_IN+
V
CC
VSS
PA_OUT
Table 1. Pin description
N° Name Type Description
1 CD_PD Digital/Output
Carrier, preamble or frame header detect output.
"1" No carrier, preamble or frame header detected
"0" Carrier, preamble or frame header detected
2REG_DATA
Digital/Input
with internal pull-down
Mains or control register access selector
"1" - Control register access
"0" - Mains access
3 GND Supply Digital ground
4 RxD Digital/Output RX data output.
5 RxTx
Digital/Input
with internal pull-up
Rx or Tx mode selection input.
"1" - RX Session
"0" - TX Session
6TxD
Digital/Input
with internal pull-down
TX data input.