1338-31DVGI datasheet(3/23 Pages) IDT

Part #	1338-31DVGI

Description	REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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IDT1338

REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM

RTC

IDT™ REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 3

IDT1338

REV J 111009

Typical Operating Circuit

Detailed Description

The following sections discuss in detail the Oscillator block,

Power Control block, Clock/Calendar Register Block and

Serial I2C block.

Oscillator Block

Selection of the right crystal, correct load capacitance and

careful PCB layout are important for a stable crystal

oscillator. Due to the optimization for the lowest possible

current in the design for these oscillators, losses caused by

parasitic currents can have a significant impact on the

overall oscillator performance. Extra care needs to be taken

to maintain a certain quality and cleanliness of the PCB.

Crystal Selection

The key parameters when selecting a 32 kHz crystal to work

with IDT1338 RTC are:

• Recommended Load Capacitance

• Crystal Effective Series Resistance (ESR)

• Frequency Tolerance

Effective Load Capacitance

Please see diagram below for effective load capacitance

calculation. The effective load capacitance (CL) should

match the recommended load capacitance of the crystal in

order for the crystal to oscillate at its specified parallel

resonant frequency with 0ppm frequency error.

In the above figure, X1 and X2 are the crystal pins of our

device. Cin1 and Cin2 are the internal capacitors which

include the X1 and X2 pin capacitance. Cex1 and Cex2 are

the external capacitors that are needed to tune the crystal

frequency. Ct1 and Ct2 are the PCB trace capacitances

between the crystal and the device pins. CS is the shunt

capacitance of the crystal (as specified in the crystal

manufacturer's datasheet or measured using a network

analyzer).

Note: IDT1338CSRI integrates a standard 32.768 kHz

crystal in the package and contributes an additional

frequency error of 10ppm at nominal VCC (+3.3 V) and

TA=+25°C.

CPU

X1

X2

VCC

SQW/OUT

VBAT

GND

SDA

SCL

CRYSTAL

IDT1338

+

-

VCC

2k

VCC

10k

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