PCF2127T 데이터 시트보기 (PDF) - NXP Semiconductors.
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PCF2127T Datasheet PDF : 101 Pages
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NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
After lead forming and cutting, there remain stubs from the package assembly process.
These stubs are present at the edge of the package as illustrated in Figure 4. The stubs
are at an electrical potential. To avoid malfunction of the PCF2127, it has to be ensured
that they are not shorted with another electrical potential (e.g. by condensation).
7.2 Pin description
Table 4. Pin description of PCF2127
Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise specified.
Symbol
Pin
Description
PCF2127AT
PCF2127T
SCL
1
1
combined serial clock input for both I2C-bus and SPI-bus
SDI
2
2
serial data input for SPI-bus
connect to pin VSS if I2C-bus is selected
SDO
3
3
serial data output for SPI-bus, push-pull
SDA/CE
4
4
combined serial data input and output for the I2C-bus and
chip enable input (active LOW) for the SPI-bus
IFS
5
5
interface selector input
connect to pin VSS to select the SPI-bus
connect to pin BBS to select the I2C-bus
TS
6
6
timestamp input (active LOW) with 200 k internal pull-up
resistor (RPU)
CLKOUT
7
7
clock output (open-drain)
VSS
8
8
n.c.
9 to 12
-
ground supply voltage
not connected; do not connect; do not use as feed through
TEST
13
9
do not connect; do not use as feed through
PFO
14
10
power fail output (open-drain; active LOW)
PFI
15
11
power fail input
RST
16
12
reset output (open-drain; active LOW)
INT
17
13
interrupt output (open-drain; active LOW)
BBS
18
14
output voltage (battery backed)
VBAT
19
15
battery supply voltage (backup)
connect to VSS if battery switch-over is not used
VDD
20
16
supply voltage
PCF2127
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 19 December 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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