PRELIMINARY CY14B101P
Document #: 001-44109 Rev. *B Page 2 of 32
PinoutsFigure 1. Pin Diagram - 16-Pin SOIC
Table 1. Pin Definitions
Pin Name I/O Type Description
CS Input Chip Select. Activates the device when pulled LOW. Driving this pin HIGH puts the device in low
power standby mode.
SCK Input Serial Clock. Runs at speeds up to a maximum of 25 MHz. All inputs are latched at the rising edge
of this clock. Outputs are driven at the falling edge of the clock.
SI Input Serial Input. Pin for input of all SPI instructions and data.
SO Output Serial Output. Pin for output of data through SPI.
WP Input Write Protect. Implements hardware write protection in SPI.
HOLD Input HOLD Pin. Suspends Serial Operation.
HSB Input/Output Hardware Store Busy: A weak internal pull up keeps this pin pulled HIGH. If not used, this pin is
left as No Connect.
Output: Indicates busy status of nvSRAM when LOW.
Input: Hardware Store implemented by pulling this pin LOW externally.
V
CAP
Power Supply AutoStore Capacitor. Supplies power to the nvSRAM during power loss to STORE data from the
SRAM to nonvolatile elements. If AutoStore is not needed, this pin must be left as No Connect. It
must never be connected to GND.
V
RTCcap
Power Supply Capacitor Backup for RTC. Left unconnected if V
RTCbat
is used.
V
RTCbat
Power Supply Battery Backup for RTC. Left unconnected if V
RTCcap
is used.
Xout Output Crystal Output connection. Drives crystal on start up.
Xin Input Crystal Input connection. For 32.768 kHz crystal.
INT Output Interrupt Output. Programmable to respond to the clock alarm, the watchdog timer, and the power
monitor. Also programmable to either active HIGH (push or pull) or LOW (open drain).
NC No Connect No Connect. This pin is not connected to the die.
GND Power Supply Ground
V
CC
Power Supply Power Supply (2.7-3.6V)
INT
GND
WP
VCAP
1
2
3
4
5
6
7
89
10
11
12
13
NC 16
15
14
VCC
SO
SI
SCK
CS
HSB
HOLD
Top Vie w
not to scale
VRTCbat
Xout
Xin
VRTCcap
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