Cypress CY14B101P manual Pinouts, Pin Definitions Pin Name Type Description, Hold

PRELIMINARYCY14B101P

Pinouts

Figure 1. Pin Diagram - 16-Pin SOIC

		NC	1	16	VCC
VRTCbat			2	15	INT
	Xout		3	14	VCAP
		Xin	4	Top View 13	SO
				not to scale	SI
		WP	5	12
			6		SCK
	HOLD			11
VRTCcap			7	10
					CS
	GND		8	9
					HSB

Table 1. Pin Definitions

Pin Name					I/O Type			Description
					Input		Chip Select. Activates the device when pulled LOW. Driving this pin HIGH puts the device in low
				CS
							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.
					Input		Write Protect. Implements hardware write protection in SPI.
			WP
	HOLD				Input		HOLD	Pin. Suspends Serial Operation.
					Input/Output		Hardware Store Busy: A weak internal pull up keeps this pin pulled HIGH. If not used, this pin is
		HSB
							left as No Connect.
							Output: Indicates busy status of nvSRAM when LOW.
							Input: Hardware Store implemented by pulling this pin LOW externally.
	VCAP				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.
VRTCcap					Power Supply		Capacitor Backup for RTC. Left unconnected if VRTCbat is used.
VRTCbat					Power Supply		Battery Backup for RTC. Left unconnected if VRTCcap 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
		VCC			Power Supply	Power Supply (2.7-3.6V)

Document #: 001-44109 Rev. *B Page 2 of 32

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