CYW20737
2. Pin Assignments
2.1 Pin Descriptions
Table 8. Pin Descriptions
Pin Number
Radio I/O
Pin Name
I/O
I/O
Power Domain
Description
6
RF
VDD_RF
RF antenna port
RF Power Supplies
4
VDDIF
I
I
I
I
VDD_RF
VDD_RF
VDD_RF
VDD_RF
IFPLL power supply
RF front-end supply
VCO, LOGEN supply
5
VDDFE
7
VDDVCO
VDDPLL
8
RFPLL and crystal oscillator supply
Power Supplies
11
VDDC
VDDO
VDDM
I
I
I
VDDC
VDDO
VDDM
Baseband core supply
I/O pad and core supply
I/O pad supply
28
14
Clock Generator and Crystal Interface
9
XTALI
I
VDD_RF
VDD_RF
VDDO
Crystal oscillator input. See page 12 for options.
Crystal oscillator output.
10
1
XTALO
XTALI32K
O
I
Low-power oscillator (LPO) input is used.
Alternative Function:
■ P11
■ P27
32
XTALO32K
O
VDDO
Low-power oscillator (LPO) output.
Alternative Function:
■ P12
■ P26
Core
18
RESET_N
TMC
I/O PU
I
VDDO
VDDO
Active-low system reset with open-drain output & internal
pull-up resistor
17
Test mode control
High: test mode
Connect to GND if not used.
UART
12
UART_RXD
UART_TXD
I
VDDM
VDDM
UART serial input – Serial data input for the HCI UART
interface. Leave unconnected if not used.
Alternative function:
■ GPIO3
13
O, PU
UART serial output – Serial data output for the HCI UART
interface. Leave unconnected if not used.
Alternative Function:
■ GPIO2
Document Number: 002-16365 Rev. *C
Page 17 of 36
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