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Teilenummer | PCF85363ATT |
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Beschreibung | Tiny Real-Time Clock/calendar | |
Hersteller | NXP Semiconductors | |
Logo | ||
Gesamt 30 Seiten PCF85363A
Tiny Real-Time Clock/calendar with 64 byte RAM, alarm
function, battery switch-over time stamp input, and I2C-bus
Rev. 1 — 10 July 2014
Product data sheet
1. General description
The PCF85363A is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low
power consumption and with automatic switching to battery on main power loss. The RTC
can also be configured as a stop-watch (elapsed time counter). Three time log registers
triggered from battery switch-over as well as input driven events. Featuring clock output
and two independent interrupt signals, two alarms, I2C interface and quartz crystal
calibration, 64 byte battery backed-up RAM.
For a selection of NXP Real-Time Clocks, see Table 72 on page 86
2. Features and benefits
Provides year, month, day, weekday, hours, minutes, seconds and 100th seconds
based on a 32.768 kHz quartz crystal
Stop-watch mode for elapsed time counting. From 100th seconds to 999999 hours
Two independent alarms
Battery back-up circuit
WatchDog timer
Three timestamp registers
Two independent interrupt generators plus predefined interrupts at every second,
minute, or hour
64 byte battery backed-up RAM
Frequency adjustment via programmable offset register
Clock operating voltage: 0.9 V to 5.5 V
Low current; typical 0.28 A at VDD = 3.0 V and Tamb = 25 C
400 kHz two-line I2C-bus interface (at VDD = 1.8 V to 5.5 V)
Programmable clock output for peripheral devices (32.768 kHz, 16.384 kHz,
8.192 kHz, 4.096 kHz, 2.048 kHz, 1.024 kHz, and 1 Hz)
Configurable oscillator circuit for a wide variety of quartzes: CL = 6 pF, CL = 7 pF, and
CL = 12.5 pF
3. Applications
Elapsed time counter
Printers and copiers
Network powered devices
Battery backed up systems
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 23.
NXP Semiconductors
PCF85363A
Tiny RTC with 64 byte RAM, alarm, battery switch-over and I2C-bus
8. Functional description
The PCF85363A contains 8-bit registers for time information, for timestamp information
and registers for system configuration. Included is an auto-incrementing register address,
an on-chip 32.768 kHz oscillator with integrated capacitors, a frequency divider which
provides the source clock for the Real-Time Clock (RTC) and calender, and an I2C-bus
interface with a maximum data rate of 400 kbit/s.
The built-in address register will increment automatically after each read or write of a data
byte. After register 2Fh, the auto-incrementing will wrap around to address 00h. When the
RAM is accessed, the wrap around will happen after address 7Fh, (see Figure 5).
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Fig 5. Address register incrementing
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PCF85363A
Product data sheet
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Fig 6. Register map
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All information provided in this document is subject to legal disclaimers.
Rev. 1 — 10 July 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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8.1.2 Control registers overview
Table 7. Control and function registers overview
Bit positions labeled as - are not implemented. After reset, all registers are set according to Table 62 on page 58.
Address Register name Bit
765432
Offset register
24h Offset
OFFSET[7:0]
Control registers
25h Oscillator
CLKIV
OFFM
12_24
LOWJ
OSCD[1:0]
26h Battery_switch -
-
-
BSOFF
BSRR
BSM[1:0]
27h Pin_IO
CLKPM
TSPULL TSL
TSIM
TSPM[1:0]
28h Function
100TH
PI[1:0]
RTCM
STOPM
COF[2:0]
29h
INTA_enable
ILPA
PIEA
OIEA
A1IEA
A2IEA
TSRIEA
2Ah INTB_enable ILPB
PIEB
OIEB
A1IEB
A2IEB
TSRIEB
2Bh Flags
PIF
A2F
A1F
WDF
BSF
TSR3F
Single RAM byte
2Ch RAM_byte
B[7:0]
WatchDog registers
2Dh WatchDog
WDM
WDR[4:0]
Stop
2Eh
Stop_enable
-
-
-
-
-
-
Reset
2Fh Resets
CPR
0
1
0
SR 1
RAM (64 byte)
40h to
7Fh
RAM
B[7:0]
10
CL[1:0]
BSTH
INTAPM[1:0]
BSIEA
BSIEB
TSR2F
WDIEA
WDIEB
TSR1F
WDS[1:0]
- STOP
0 CTS
Reference
Section 8.8
Section 8.10
Section 8.11
Section 8.12
Section 8.13
Section 8.9
Section 8.9
Section 8.14
Section 8.6
Section 8.5
Section 8.16
Section 8.15
Section 8.17
12 Page | ||
Seiten | Gesamt 30 Seiten | |
PDF Download | [ PCF85363ATT Schematic.PDF ] |
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