Cypress CY4636, User Manual

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28 CY4636 WirelessUSB™ LP Keyboard Mouse Reference Design Kit User Guide, Doc. # 001-70355 Rev. *A
Hardware
18 NC Connect to GND
19 RESV Must be connected to GND.
20 NC Connect to GND
21 NC Connect to GND
22 NC Connect to GND
23 NC Connect to GND
24 SS SPI enable, active LOW assertion. Enables and frames transfers
25 SCK SPI clock
26 IRQ Interrupt output (configurable active HIGH or LOW) or GPIO
27 MOSI SPI data input pin (Master Out Slave In) or SDAT
28 MISO
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.
29 XOUT
Buffered 0.75, 1.5, 3, 6, or 12 MHz clock, PACTL, or GPIO.
Tristates in sleep mode (configure as GPIO drive LOW)
30 PACTL Control signal for external PA, T/R switch, or GPIO.
31 NC Connect to GND
32 NC Connect to GND
33
V
IO
I/O interface voltage, 1.8–3.6 V
34 RST
Device reset. Internal 10 kohm pull down resistor. Active HIGH,
connect through a 0.47
μ F capacitor to VBAT. Must have RST = 1 event the
first time power is applied to the radio. Otherwise the state of the radio control
registers is unknown.
35
V
DD
Decoupling pin for 1.8 V logic regulator, connect through a 0.47 μ F capacitor
to GND.
36 NC Connect to GND
37 L/D PMU inductor/diode connection, when used. If not used, connect to GND
38
V
BAT(0-2)
VBAT = 1.8 V to 3.6 V. Main supply.
39 NC Connect to GND
40
V
REG
PMU boosted output voltage feedback
Table 4-1. CYRF6936 Chip Pin Details
(continued)
Pin Name Description