PCF2127A 데이터 시트보기 (PDF) - NXP Semiconductors.

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PCF2127A

Integrated RTC, TCXO and quartz crystal

NXP Semiconductors. 

NXP Semiconductors

7. Pinning information

7.1 Pinning

PCF2127A

Integrated RTC, TCXO and quartz crystal

SCL 1

SDI 2

SDO 3

SDA/CE 4

IFS 5

TS 6

CLKOUT 7

VSS 8

n.c. 9

n.c. 10

PCF2127A

20 VDD

19 VBAT

18 BBS

17 INT

16 RST

15 PFI

14 PFO

13 TEST

12 n.c.

11 n.c.

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Top view. For mechanical details, see Figure 53.

Fig 2. Pin configuration for SO20 (PCF2127A)

7.2 Pin description

Table 3. Pin description of SO20 (PCF2127A)

Symbol

Pin

Description

SCL

1

combined serial clock input for both I2C-bus and SPI-bus; may

float when SDA/CE inactive

SDI

2

serial data input for SPI-bus; may float when SDA/CE inactive

SDO

3

serial data output for SPI-bus, push-pull

SDA/CE

4

combined serial data input and output for the I2C interface and chip

enable input (active LOW) for the SPI-bus

IFS

5

interface selector input

connect to pin VSS to select the SPI-bus

connect to pin BBS to select the I2C interface

TS

6

CLKOUT

7

timestamp input (active LOW) with 200 kΩ internal pull-up resistor

(RPU)

clock output (open-drain)

VSS

8

ground supply voltage

n.c.

9 to 12 not connected; do not connect; do not use as feed through

TEST

13

do not connect; do not use as feed through

PFO

14

power fail output (open-drain; active LOW)

PFI

15

power fail input

RST

16

reset output (open-drain; active LOW)

INT

17

interrupt output (open-drain; active LOW)

BBS

18

output voltage (battery backed)

VBAT

VDD

19

battery supply voltage (backup)

20

supply voltage

PCF2127A_2

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 02 — 7 May 2010

© NXP B.V. 2010. All rights reserved.

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