PCF2127AT/1,518 NXP Semiconductors, PCF2127AT/1,518 Datasheet - Page 54
![no-image](/images/manufacturer_photos/0/4/487/nxp_semiconductors_sml.jpg)
PCF2127AT/1,518
Manufacturer Part Number
PCF2127AT/1,518
Description
IC RTC/CALENDAR TCXO QTZ 20SOIC
Manufacturer
NXP Semiconductors
Type
Clock/Calendar/Alarmr
Datasheet
1.PCF2127AT1518.pdf
(80 pages)
Specifications of PCF2127AT/1,518
Package / Case
20-SOIC (0.300", 7.50mm Width)
Time Format
HH:MM:SS (12/24 hr)
Memory Size
512B
Date Format
YY-MM-DD-dd
Interface
I²C, 2-Wire Serial
Voltage - Supply
1.8 V ~ 4.2 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Function
Serial Clock, Timestamp, Timekeeper, Watchdog, Alarm, Calendar, Timer, Timer Interrupt
Rtc Memory Size
512 bytes
Supply Voltage (max)
4.2 V
Supply Voltage (min)
1.8 V
Mounting Style
SMD/SMT
Rtc Bus Interface
I2C
Supply Current
2600 nA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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9. Interfaces
PCF2127A_2
Product data sheet
Fig 33. Interface selection
a. SPI-bus interface selection
SDO
V
SCL
V
SDI
CE
DD
SS
To select the SPI-bus interface, pin IFS has to be
connected to pin V
SDA/CE
The PCF2127A has a selectable I
the interface selection pin IFS (see
Table 56.
SDO
Pin
IFS
SCL
V
SDI
IFS
SS
SS
.
1
2
3
4
5
6
7
8
9
10
PCF2127A
Connection
V
BBS
SS
Interface selection input pin IFS
All information provided in this document is subject to legal disclaimers.
20
19
18
17
16
15
14
13
12
11
V
BBS
001aaj679
DD
Rev. 02 — 7 May 2010
2
Bus interface
SPI-bus
I
C-bus or SPI-bus interface. The selection is done using
2
C-bus
Table
SDA
b. I
SCL
V
V
DD
SS
56).
To select the I
connected to pin BBS.
2
C-bus interface selection
Integrated RTC, TCXO and quartz crystal
R PU
2
SDA/CE
R PU
C-bus interface pin IFS has to be
SDO
SCL
V
SDI
IFS
SS
1
2
3
4
5
6
7
8
9
10
Reference
Section 9.1
Section 9.2
PCF2127A
PCF2127A
© NXP B.V. 2010. All rights reserved.
20
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BBS
V
001aaj680
DD
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