PCF2127AT/1,518 NXP Semiconductors, PCF2127AT/1,518 Datasheet - Page 54

• Manufacturer Part Number: PCF2127AT/1,518
• Description: IC RTC/CALENDAR TCXO QTZ 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

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

NXP Semiconductors
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
19
18
17
16
15
14
13
12
11
BBS
V
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DD
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