PCF2128T1_技术文档

PCF2128

Integrated RTC / TCXO / Crystal

Rev. 00.03 — 4 June 2007

Preliminary [short] data sheet

1. General description

The PCF2128 is a ready to run CMOS real time clock/calendar with an integrated

temperature compensated crystal oscillator (TCXO). In timekeeping applications the high

accuracy of the PCF2128 allows it to be used as a replacement for costly and higher

powered long wave receivers or GPS receivers. A programmable battery switch-over

circuit enables an uninterruptible power supply and consequently continuous timekeeping.

The PCF2128 additionally features 512 bytes of general purpose RAM, a programmable

watchdog, a time stamp facility and a voltage monitoring facility. Programming is possible

using either an SPI or an I²C-bus interface.

2. Features

Integration of a 32.768 kHz quartz

512 bytes of general purpose static

crystal in the same package as the RTC

RAM

temperature compensated crystal

oscillator (TCXO) with integrated

capacitors.

1 second or 1 minute interrupt output

accuracy:

oscillator stop detection

typically 3 ppm from−20 °C to +70 °C,

typically 5 ppm from −40 °C to +85 °C

provides year, month, day, weekday,

two line bi-directional 1 MHz fast mode

hours, minutes and seconds

plus I²C interface

programmable alarm function with

interrupt capability

timestamp input

programmable countdown timer with

interrupt capability

power-on reset

programmable watchdog timer with

interrupt and reset capability

3 line SPI interface with separate data

input and output (maximum speed

6.5 Mbits/s)

timestamp function with interrupt

programmable square wave output pin

capability

battery backup input pin and switch-over I²C-bus slave address: read A3H and

circuitry write A2H

extra power fail detection with input and clock operating voltage: <tbd> to 5.5 V

output pins

battery low detection

low backup current; typical 0.95 μA at

_DD= 3.0 V and T_amb= 25 °C

selectable I²C and SPI interface

V

battery backed output voltage pin

PCF2128

NXP Semiconductors

Real time clock / calendar

3. Quick reference data

Table 1.

Quick reference data

V_DD= 1.8 to 5.5 V; V_SS= 0 V; T_amb= −40 to +85 °C unless otherwise specified.

Symbol

V_DD

Parameter

Conditions

Min

Typ

Max

Unit

supply voltage

supply current

1.8

-

5.5

V

I_DD

interface active

f_SCL= 6.5 MHz

f_SCL= 1.0 MHz

-

800

200

μA

interface inactive (f_SCL= 0 kHz)

timekeeping and power management

configuration, CLKOUT disabled;

V_DD= 5.0 V

V_DD= 3.0 V

-

2700

2100

-

nA

interface inactive (f_SCL= 0 kHz)

timekeeping configuration; T_amb= +25 °C

V_DD= 5.0 V

V_DD= 3.0 V

-

850

-

nA

-

450

-

nA

f_SCL

SCL clock frequency

0

-

6.5

-

MHz

ppm

°C

Δf / f

frequency stability

(f_o= 32.768 kHz)

T

_amb= −40 to +85 °C

-

5

3

-

T_amb= −20 to +70 °C

-

5

T_amb

T_stg

ambient temperature

storage temperature

operating

−40

−65

+85

+150

-

°C

4. Ordering information

Table 2:

Ordering information

Type number Topside

mark

Package

Name

Description

plastic thin shrink small outline package; 20 leads; body width 4.4mm

Version

PCF2128T / 1 PCF2128T SO20

SOT163-1

PCF2128_SDS_0

Preliminary [short] data sheet

Rev. 00.03 — 4 June 2007

2 of 10

PCF2128

NXP Semiconductors

Real time clock / calendar

5. Block diagram

INT

17

TCXO

TEMP

OSCI

CONTROL 1

CONTROL 2

00

01

02

03

04

05

06

07

08

09

0A

0B

0C

0D

0E

0F

10

11

12

13

14

15

16

17

18

DIVIDER

AND

TIMER

32.768 kHz

OSCO

CONTROL 3

7

CLKOUT

SECONDS

MINUTES

18

V

OUT

internal

power

supply

HOURS

1 Hz

20

19

8

V

DD

DAYS

BATTERY BACK UP

SWITCH-OVER

CIRCUITRY

V

BAT

WEEKDAYS

LOGIC

CONTROL

V

SS

MONTHS

YEARS

OSCILLATOR

MONITOR

SECOND ALARM

MINUTE ALARM

HOUR ALARM

DAY ALARM

RESET

16

RST

4

3

2

1

SDA/CE

SDO

SDI

ADDRESS

REGISTER

WEEKDAY ALARM

CLOCKOUT CONTROL

TIMER CONTROL

COUNTDOWN TIMER

SERIAL BUS

INTERFACE

SCL

5

INTERFACE

SELECTORS

1/16 SECOND TIMESTAMP

SECOND TIMESTAMP

MINUTE TIMESTAMP

HOUR TIMESTAMP

DAY TIMESTAMP

IFS

TS

2

SCL

SDA/CE

I C BUS

INTERFACE

6

MONTH TIMESTAMP

YEAR TIMESTAMP

SCL

SDO

CRYSTAL AGING OFFSET 19

512 BYTES

STATIC RAM

RAM ADDRESS MSB

RAM ADDRESS LSB

RAM WRITE

1A

1B

1C

1D

SDI

SDA/CE

15

1.25 V

TEMPERATURE

SENSOR

RAM READ

PFI

TEMP

(internal)

14

13

PFO

TEST

001aag059_02

Fig 1. Block diagram of PCF2128

PCF2128_SDS_0

Preliminary [short] data sheet

Rev. 00.03 — 4 June 2007

3 of 10

PCF2128

NXP Semiconductors

Real time clock / calendar

6. Pinning information

6.1 Pinning

1

2

20

19

18

17

16

15

14

13

12

11

SCL

SDI

V

DD

die

BAT

OUT

3

SDO

oscillator

4

SDA/CE

IFS

INT

5

RST

PFI

PCF2128

6

TS

7

CLKOUT

PFO

TEST

n.c.

8

V

SS

9

n.c.

10

n.c.

001aag576

001aag060

Fig 2. Pin configuration SO20

Fig 3. SO20 (3d)

Table 3:

Symbol

SCL

Pin description PCF2128

Pin Description

Symbol Pin Description

1

combined serial clock input for both I²C

and SPI interface. May float when CE

inactive.

V_DD

20

positive supply voltage

SDI

2

3

4

serial data input for SPI interface. May

float when CE inactive.

V_BAT

V_OUT

INT

19

18

17

battery backup supply voltage

battery backed output voltage

SDO

serial data output for SPI interface,

push-pull

SDA / CE

combined serial data input / output for the

I²C interface and chip enable input (active

LOW) for the SPI interface.

interrupt output (open-drain; active

LOW)

IFS

5

interface selector input

RST

16

reset output (open drain; active LOW)

• connect to ground to select the SPI

interface

• connect to V_OUT(pin 18) to select the

I²C interface

TS

6

timestamp input (active LOW) with 200 kΩ

PFI

PFO

TEST

nc

15

14

13

12

11

power fail input

internal pull-up resistor

CLKOUT

V_SS

nc

7

clock output (open drain)

ground

power fail output (open drain; active

LOW)

8

Do not connect and do not use as feed

through.

9

Do not connect and do not use as feed

through.

Do not connect and do not use as feed

through.

nc

10

Do not connect and do not use as feed

through.

nc

Do not connect and do not use as feed

through.

PCF2128_SDS_0

Preliminary [short] data sheet

Rev. 00.03 — 4 June 2007

4 of 10

PCF2128

NXP Semiconductors

Real time clock / calendar

7. Limiting values

Table 4:

Symbol

V_DD

Limiting valuesIn accordance with the Absolute Maximum Rating System (IEC 60134).

Parameter

Conditions

Min

−0.5

Max

+6.5

Unit

V

supply voltage

V_BAT

backup battery supply

voltage

V

I_DD

V_I

supply current

−50

−0.5

−10

-

+50

+6.5

+10

300

+85

mA

V

input voltage

V_O

I_I

output voltage

V

input current

mA

mW

°C

I_O

output current

P_tot

T_amb

T_stg

total power dissipation

ambient temperature

storage temperature

−40

−65

+150

7.1 ESD values

• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per

JESD22-A115 and 2000 V CDM per JESD22-C101.

• Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA.

8. Application information

• The PCF2128 is a ready to run real time clock; no external quartz is required.

• You can set different configurations in your application depending on the PCF2128

functions you want to use.

• The integration of the quartz crystal in the same package as the RTC has the

following advantages:

– elimination of crystal procurement issues

– elimination of RTC frequency tuning

– no more crystal PCB layout issues.

• You can select the SPI or I²C-bus interface using the IFS pin.

• By connecting a battery to V_BATan uninterruptible power supply is guaranteed.

• You can use the battery backed voltage V_OUTto supply an external RAM to retain

RAM data in battery backup mode.

• You can connect PFI through an external voltage divider to V_DDto allow extra power

fail detection. If not used, connect PFI to V_SS

.

• You can connect the timestamp input pin TS to a push button for tamper detection.

PCF2128_SDS_0

Preliminary [short] data sheet

Rev. 00.03 — 4 June 2007

5 of 10

PCF2128

NXP Semiconductors

Real time clock / calendar

8.1 Application example

8.1.1 Timekeeping, power management, CLKOUT, timestamp and interface active

PCF2128 used for timekeeping, power management, CLKOUT and timestamp functions

(see Figure 4). The interface is active. V_outsupplies an external chip (e.g. SRAM).

mgm002_09

V_DD= 2.2 - 5.5 V

R_PU

R₁

PCF2128

microcontroller

SCL

1

2

3

4

5

6

7

V_DD20

SCL

SDI

INT

V_BAT

19

SDI

SDO

CE

to the MCU

from PCF2128

INT

RST

PFO

V_OUT

18

17

16

SDO

SDA / CE

IFS

INT

RST

PFO

RST

TS

PFI 15

CLKOUT

PFO

n.c.

14

Batt

100 nF

V_SS

8

9

13

12

n.c.

100 nF

V_SS

R₂

n.c.

10

11

SRAM

V_DD

V_SS

Fig 4. Application diagram: timekeeping, power management, CLKOUT, timestamp with the interface active

PCF2128_SDS_0

Preliminary [short] data sheet

Rev. 00.03 — 4 June 2007

6 of 10

PCF2128

NXP Semiconductors

Real time clock / calendar

9. Revision history

Table 5.

Revision history

Document ID

Release date

Data sheet status

Change notice

Supersedes

PCF2128__SDS_00.03

Modifications:

<tbd>

Preliminary

PCF2128__SDS_00.02

• Added Figure 3.

20070604 Preliminary

• Datasheet text ammended. Section 8.1 corrected.

PCF2128__SDS_00.02

Modifications:

PCF2128__SDS_00.01

-

PCF2128__SDS_00.01

20070509

Preliminary short data sheet

PCF2128_SDS_0

Preliminary [short] data sheet

Rev. 00.03 — 4 June 2007

7 of 10

PCF2128

NXP Semiconductors

Real time clock / calendar

10. Legal information

10.1 Data sheet status

Document status^[1][2]

Product status^[3]

Development

Definition

Objective [short] data sheet

This document contains data from the objective specification for product development.

This document contains data from the preliminary specification.

This document contains the product specification.

Preliminary [short] data sheet Qualification

Product [short] data sheet Production

[1]

[2]

[3]

Please consult the most recently issued document before initiating or completing a design.

The term ‘short data sheet’ is explained in section “Definitions”.

The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status

information is available on the Internet at URL http://www.nxp.com.

result in personal injury, death or severe property or environmental damage.

10.2 Definitions

NXP Semiconductors accepts no liability for inclusion and/or use of NXP

Semiconductors products in such equipment or applications and therefore

such inclusion and/or use is at the customer’s own risk.

Draft — The document is a draft version only. The content is still under

internal review and subject to formal approval, which may result in

modifications or additions. NXP Semiconductors does not give any

representations or warranties as to the accuracy or completeness of

information included herein and shall have no liability for the consequences of

use of such information.

Applications — Applications that are described herein for any of these

products are for illustrative purposes only. NXP Semiconductors makes no

representation or warranty that such applications will be suitable for the

specified use without further testing or modification.

Limiting values — Stress above one or more limiting values (as defined in

the Absolute Maximum Ratings System of IEC 60134) may cause permanent

damage to the device. Limiting values are stress ratings only and operation of

the device at these or any other conditions above those given in the

Characteristics sections of this document is not implied. Exposure to limiting

values for extended periods may affect device reliability.

Short data sheet — A short data sheet is an extract from a full data sheet

with the same product type number(s) and title. A short data sheet is intended

for quick reference only and should not be relied upon to contain detailed and

full information. For detailed and full information see the relevant full data

sheet, which is available on request via the local NXP Semiconductors sales

office. In case of any inconsistency or conflict with the short data sheet, the

full data sheet shall prevail.

Terms and conditions of sale — NXP Semiconductors products are sold

subject to the general terms and conditions of commercial sale, as published

at http://www.nxp.com/profile/terms, including those pertaining to warranty,

intellectual property rights infringement and limitation of liability, unless

explicitly otherwise agreed to in writing by NXP Semiconductors. In case of

any inconsistency or conflict between information in this document and such

terms and conditions, the latter will prevail.

10.3 Disclaimers

General — Information in this document is believed to be accurate and

reliable. However, NXP Semiconductors does not give any representations or

warranties, expressed or implied, as to the accuracy or completeness of such

information and shall have no liability for the consequences of use of such

information.

No offer to sell or license — Nothing in this document may be interpreted or

construed as an offer to sell products that is open for acceptance or the grant,

conveyance or implication of any license under any copyrights, patents or

other industrial or intellectual property rights.

Right to make changes — NXP Semiconductors reserves the right to make

changes to information published in this document, including without

limitation specifications and product descriptions, at any time and without

notice. This document supersedes and replaces all information supplied prior

to the publication hereof.

10.4 Trademarks

Notice: All referenced brands, product names, service names and trademarks

are the property of their respective owners.

Suitability for use — NXP Semiconductors products are not designed,

authorized or warranted to be suitable for use in medical, military, aircraft,

space or life support equipment, nor in applications where failure or

malfunction of a NXP Semiconductors product can reasonably be expected to

I²C-bus — logo is a trademark of NXP B.V.

11. Contact information

For additional information, please visit: http://www.nxp.com

For sales office addresses, send an email to: salesaddresses@nxp.com

PCF2128_SDS_0

Preliminary [short] data sheet

Rev. 00.03 — 4 June 2007

8 of 10

PCF2128

NXP Semiconductors

Real time clock / calendar

Notes

PCF2128_SDS_0

Preliminary [short] data sheet

Rev. 00.03 — 4 June 2007

9 of 10

PCF2128

NXP Semiconductors

Real time clock / calendar

12. Contents

1

General description . . . . . . . . . . . . . . . . . . . . . . 1

2

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Quick reference data . . . . . . . . . . . . . . . . . . . . . 2

Ordering information. . . . . . . . . . . . . . . . . . . . . 2

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pinning information. . . . . . . . . . . . . . . . . . . . . . 4

Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 5

ESD values. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3

4

5

6

6.1

7

7.1

8

8.1

8.1.1

Application information. . . . . . . . . . . . . . . . . . . 5

Application example . . . . . . . . . . . . . . . . . . . . . 6

Timekeeping, power management, CLKOUT,

timestamp and interface active. . . . . . . . . . . . . 6

9

Revision history. . . . . . . . . . . . . . . . . . . . . . . . . 7

10

Legal information. . . . . . . . . . . . . . . . . . . . . . . . 8

Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 8

Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

10.1

10.2

10.3

10.4

11

12

Contact information. . . . . . . . . . . . . . . . . . . . . . 8

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section ‘Legal information’.

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddresses@nxp.com

Date of release: 4 June 2007

Document identifier: PCF2128_SDS_0


型号：	PCF2128T1
厂家：	NXP
描述：	Integrated RTC / TCXO / Crystal 集成RTC / TCXO /晶体晶体石英晶振温度补偿晶振
文件：	总10页 (文件大小：324K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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