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NXP Semiconductors Electronic Components Datasheet

PCF8523 Datasheet

Real-Time Clock (RTC) and calendar

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PCF8523
Real-Time Clock (RTC) and calendar
Rev. 3 — 30 March 2011
Product data sheet
1. General description
The PCF8523 is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low power
consumption. Data is transferred serially via an I2C-bus with a maximum data rate of
1000 kbit/s. Alarm and timer functions are available with the possibility to generate a
wake-up signal on an interrupt pin. An offset register allows fine-tuning of the clock. The
PCF8523 has a backup battery switch-over circuit, which detects power failures and
automatically switches to the battery supply when a power failure occurs.
2. Features and benefits
Provides year, month, day, weekday, hours, minutes, and seconds based on a
32.768 kHz quartz crystal
Resolution: seconds to years
Clock operating voltage: 1.0 V to 5.5 V
Low backup current: typical 150 nA at VDD = 3.0 V and Tamb = 25 C
2 line bidirectional 1 MHz Fast-mode Plus (Fm+) I2C interface
Battery backup input pin and switch-over circuit
Freely programmable timer and alarm with interrupt capability
Selectable integrated oscillator load capacitors for CL = 7 pF or CL = 12.5 pF
Internal Power-On Reset (POR)
Open-drain interrupt or clock output pins
Programmable offset register for frequency adjustment
3. Applications
Time keeping application
Battery powered devices
Metering
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 19.


NXP Semiconductors Electronic Components Datasheet

PCF8523 Datasheet

Real-Time Clock (RTC) and calendar

No Preview Available !

NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
4. Ordering information
5. Marking
Table 1. Ordering information
Type number
Package
Name
Description
Version
PCF8523T/1
SO8 plastic small outline package; 8 leads;
body width 3.9 mm
SOT96-1
PCF8523TS/1
TSSOP14 plastic thin shrink small outline package; 14 leads; SOT402-1
body width 4.4 mm
PCF8523TK/1
HVSON8
plastic thermal enhanced very thin small outline
package; no leads; 8 terminals;
body 4 4 0.85 mm
SOT909-1
PCF8523U/12AA/1 PCF8523U bare die; 12 bumps (6-6)[1]
PCF8523U
[1] Delivery form: sawn 6-inch wafer (see Figure 41 on page 57) with gold bumps on Film Frame Carrier (FFC)
for 8-inch wafer (see Figure 42 on page 57).
Table 2. Marking codes
Type number
PCF8523T/1
PCF8523TS/1
PCF8523TK/1
PCF8523U/12AA/1
Marking code
8523T
8523TS
8523
PC8523-1
PCF8523
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 30 March 2011
© NXP B.V. 2011. All rights reserved.
2 of 66


Part Number PCF8523
Description Real-Time Clock (RTC) and calendar
Maker NXP
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PCF8523 Datasheet PDF






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