PCF2127AT/1 NXP [NXP Semiconductors], PCF2127AT/1 Datasheet - Page 4

• Manufacturer Part Number: PCF2127AT/1
• Description: Integrated RTC, TCXO and quartz crystal
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
7. Pinning information
PCF2127A_2
Product data sheet
7.1 Pinning
7.2 Pin description
Table 3.
Symbol
SCL
SDI
SDO
SDA/CE
IFS
TS
CLKOUT
V
n.c.
TEST
PFO
PFI
RST
INT
BBS
V
V
Fig 2.
SS
BAT
DD
Top view. For mechanical details, see
Pin configuration for SO20 (PCF2127A)
Pin description of SO20 (PCF2127A)
All information provided in this document is subject to legal disclaimers.
Pin
1
2
3
4
5
6
7
8
9 to 12
13
14
15
16
17
18
19
20
Rev. 02 — 7 May 2010
CLKOUT
SDA/CE
Description
combined serial clock input for both I
float when SDA/CE inactive
serial data input for SPI-bus; may float when SDA/CE inactive
serial data output for SPI-bus, push-pull
combined serial data input and output for the I
enable input (active LOW) for the SPI-bus
interface selector input
timestamp input (active LOW) with 200 kΩ internal pull-up resistor
(R
clock output (open-drain)
ground supply voltage
not connected; do not connect; do not use as feed through
do not connect; do not use as feed through
power fail output (open-drain; active LOW)
power fail input
reset output (open-drain; active LOW)
interrupt output (open-drain; active LOW)
output voltage (battery backed)
battery supply voltage (backup)
supply voltage
SDO
connect to pin V
connect to pin BBS to select the I
PU
SCL
V
SDI
IFS
n.c.
n.c.
TS
SS
)
10
1
2
3
4
5
6
7
8
9
Figure
PCF2127A
SS
53.
Integrated RTC, TCXO and quartz crystal
001aaj676
to select the SPI-bus
20
19
18
17
16
15
14
13
12
11
V
V
BBS
INT
RST
PFI
PFO
TEST
n.c.
n.c.
DD
BAT
2
C interface
2
C-bus and SPI-bus; may
PCF2127A
2
C interface and chip
© NXP B.V. 2010. All rights reserved.
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