pcf2127a NXP Semiconductors, pcf2127a Datasheet - Page 4

• Manufacturer Part Number: pcf2127a
• Description: Integrated Rtc, Tcxo And Quartz Crystal
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Pinning information
PCF2127A_1
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 PCF2127A (SO20)
Pin description of PCF2127A
Pin
1
2
3
4
5
6
7
8
9 to 12
13
14
15
16
17
18
19
20
Rev. 01 — 21 January 2010
CLKOUT
SDA/CE
Description
combined serial clock input for both I
float when CE inactive
serial data input for SPI-bus; may float when 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
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
52.
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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