CYRF6936
Document #: 38-16015 Rev. *G
Page 2 of 40
Figure 1. CYRF6936, 40 QFN – Top View
Pin Descriptions
Pin #
Name
Type Default
Description
13
RFN
I/O
I
Differential RF signal to/from antenna
11
RFP
I/O
I
Differential RF signal to/from antenna
10
RFBIAS
O
O
RF I/O 1.8V reference voltage
30
PACTL
I/O
O
Control signal for external PA, T/R switch, or GPIO
1
XTAL
I
I
12 MHz crystal
29
XOUT
I/O
O
Buffered 0.75, 1.5, 3, 6 or 12 MHz clock, PACTL, or GPIO.
Tri-states in sleep mode (configure as GPIO drive LOW)
25
SCK
I
I
SPI clock
28
MISO
I/O
Z
SPI data output pin (Master In Slave Out), or GPIO (in SPI 3-pin mode).
Tri-states when SPI 3PIN = 0 and SS is deasserted
27
MOSI
I/O
I
SPI data input pin (Master Out Slave In), or SDAT
24
SS
I
I
SPI enable, active LOW assertion. Enables and frames transfers
26
IRQ
I/O
O
Interrupt output (configurable active HIGH or LOW), or GPIO
34
RST
I
I
Device reset. Internal 10 kohm pull down resistor. Active HIGH, typically
connect through a 0.47
μF capacitor to V
BAT. Must have RST = 1 event
the first time power is applied to the radio. Otherwise the state of the radio
control registers is unknown
37
L/D
O
PMU inductor/diode connection, when used. If not used, connect to GND
40
VREG
Pwr
PMU boosted output voltage feedback
35
VDD
Pwr
Decoupling pin for 1.8V logic regulator, connect through a 0.47
μF
capacitor to GND
6, 8, 38
VBAT
Pwr
VBAT = 1.8V to 3.6V. Main supply
3, 7, 16
VCC
Pwr
VCC = 2.4V to 3.6V. Typically connected to VREG
33
VIO
Pwr
I/O interface voltage, 1.8–3.6V
19
RESV
I
Must be connected to GND
2, 4, 5, 9, 14, 15, 18, 17, 20,
21, 22, 23, 32, 36, 39, 31
NC
NC
Connect to GND
12
GND
GND
Ground
E-PAD
GND
GND
Ground
CYRF6936
40-lead QFN
RF
BIAS
NC
NC
V
BAT
V
CC
V
BAT
XTAL
V
CC
NC
NC
NC
SS
SCK
IRQ / GPIO
MOSI / SDAT
MISO / GPIO
XOUT / GPIO
PACTL / GPIO
NC
NC
23
24
25
26
27
28
29
30
22
21
10
9
2
8
7
6
1
3
5
4
* E-PAD BOTTOM SIDE
CYRF6936
Top View*
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