Rev. 1.20
3
October 28, 2020
BC45B4523
Pin Assignment
BC45B4523
24 QFN-A
1
2
3
4
5
6
7 8 9 10 11 12
13
14
15
16
17
18
19
20
21
22
23
24
RX
TA
MISO
MOSI
SCK
NCS
VREG_IN
T_VSS
TX2
T_VDD
TX1
T_VSS
VREG
_OUT
A_
VD
D
A_VSS
XTAL1
XTAL2
VMID
TD
IR
Q
RSTPD
D_VDD
D_VSS
IO_VDD
Pin Description
Pin No.
Pin Name
Type
Description
1
RX
Analog Input
Receiver input
2
TA
Analog Output
Analog Test pin
3
MISO
Digital Output
SPI: Master In Slave Out
4
MOSI
Digital Input
SPI: Master Out Slave In
5
SCK
Digital Input
SPI: Clock input
6
NCS
Digital Input
SPI: Chip Select (Active Low)
7
IO_VDD
Power
Digital I/O power supply
8
D_VSS
Power
Digital and digital I/O ground
9
D_VDD
Power
Digital core power supply (need an external 100nF decoupling
capacitor)
10
RSTPD
Digital Input
Master Reset (Active High)
11
IRQ
Digital Output
Interrupt Request output
12
TD
Digital I/O
Digital Test pin
13
T_VSS
Power
Transmitter ground
14
TX1
Output
Transmitter output # 1
15
T_VDD
Power
Transmitter power supply
16
TX2
Output
Transmitter output # 2
17
T_VSS
Power
Transmitter ground
18
VREG_IN
Power
On-chip Regulator input (5.0V)
19
VREG_OUT
Power
On-chip Regulator output (3.3V)
20
A_VDD
Power
Analog power supply (3.3V)
21
A_VSS
Power
Analog ground
22
XTAL1
Analog Input
Crystal oscillator input
23
XTAL2
Analog Output
Crystal oscillator output
24
VMID
Analog Output
Mid rail reference voltage