PCF2123BS/1,518 NXP Semiconductors, PCF2123BS/1,518 Datasheet - Page 37

• Manufacturer Part Number: PCF2123BS/1,518
• Description: IC RTC/CALENDAR SPI BUS 16HVQFN
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2123BS/1,518

• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 1.1 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-VQFN Exposed Pad, 16-HVQFN, 16-SQFN, 16-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: 935286382518

NXP Semiconductors
PCF2123
Product data sheet
Fig 24. Serial bus write example
address
counter
SCL
SDI
CE
R/W
b7
xx
0
b6
0
b5
Table 42.
In
10 minutes.
0
In
are not connected together. For this configuration, it is important that pin SDI is never left
floating. It must always be driven either HIGH or LOW. If pin SDI is left open, high I
currents may result. Short transition periods in the order of 200 ns will not cause any
problems.
Bit
7
6 to 4
3 to 0
Figure
Figure
b4
1
b3
0
Symbol
R/W
SA
addr 02
RA
25, the Months and Years registers are read. In this example, pins SDI and SDO
24, the register Seconds is set to 45 seconds and the register Minutes is set to
b2
Command byte definition
0
b1
HEX
1
All information provided in this document is subject to legal disclaimers.
b0
0
b7
Rev. 4 — 22 December 2010
0
02
b6
1
seconds data 45
b5
0
Value
0
1
001
0h to Fh
b4
0
b3
0
BCD
b2
1
b1
0
Description
data read or data write selection
write data
read data
subaddress; other codes will cause the device
to ignore data transfer
register address range
b0
1
b7
0
03
b6
0
minutes data 10
b5
0
SPI Real time clock/calendar
b4
1
b3
0
BCD
b2
0
PCF2123
© NXP B.V. 2010. All rights reserved.
b1
0
001aaf915
b0
0
04
DD
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