PCF2123BS/1,512 NXP Semiconductors, PCF2123BS/1,512 Datasheet - Page 10

• Manufacturer Part Number: PCF2123BS/1,512
• Description: IC CLOCK HVQFN16
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2123BS/1,512

• Package / Case: 16-VQFN Exposed Pad, 16-HVQFN, 16-SQFN, 16-DHVQFN
• 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
• Function: Clock, Calendar, Alarm, Watchdog
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.1 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: SPI
• Supply Current: 250 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-5051-5; 935286382512

NXP Semiconductors
PCF2123
Product data sheet
8.3.1.1 Reset
A reset is automatically generated at power-on. A reset can also be initiated with the
software reset command. It is generally recommended to make a software reset after
power-on.
A software reset can be initiated by setting the bits 6, 4 and 3 in register Control_1 logic 1
and all other bits logic 0 by sending the bit sequence 01011000 (58h), see
bit sequence is not correct, the software reset instruction will be ignored to protect the
device from accidently being reset. When sending the software instruction, the other bits
are not written.
After reset, the following mode is entered:
Fig 7.
•
•
•
•
•
•
32.768 kHz on pin CLKOUT active
24 hour mode is selected
Offset register is set to 0
No alarms set
Timer disabled
No interrupts enabled
(1) When CE is inactive, the interface is reset.
reset signal
internal
Software reset command
SCL
CE
All information provided in this document is subject to legal disclaimers.
R/W
b7
0
b6
0
Rev. 4 — 22 December 2010
b5
0
b4
1
b3
0
addr 00
b2
0
b1
HEX
0
b0
0
b7
0
b6
1
software reset 58
b5
0
b4
1
SPI Real time clock/calendar
b3
1
b2
HEX
0
b1
0
PCF2123
b0
© NXP B.V. 2010. All rights reserved.
0
Figure
001aai562
(1)
7. If this
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