MSM62X42B Просмотр технического описания (PDF) - Oki Electric Industry

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MSM62X42B

REAL TIME CLOCK IC WITH BUILT-IN CRYSTAL

Oki Electric Industry 

¡ Semiconductor

MSM62X42B

SUPPLEMENTARY DESCRIPTION

1. When "0" is written to the IRQ FLAG bit, the IRQ FLAG bit is cleared. However, if "0" is

assigned to the IRQ FLAG bit when written to the other bits, the 30-sec. ADJ bit and the

HOLD bit, the IRQ FLAG = 1 generated before the writing will be cleared. To avoid this,

always set "1" to the IRQ FLAG unless "0" is written to it intentionally. By writing "1" to it,

the IRQ FLAG bit does not become "1".

2. Since the IRQ FLAG bit becomes "1" in some cases when rewriting either of the t1, t0 or ITRPT/

STND bit of register CE, be sure to write "0" to the IRQ FLAG bit after writing to make valid

the IRQ FLAG = 1 to be generated after it.

3. The relationship between SDT.P OUT and IRQ FLAG bit is shown below:

STD.P OUT

IRQ FLAG Bit

open

"L"

1

0

Approx. 1.95ms

SUGGESTIONS FOR P.C.B ASSEMBLY

1. This IC can bear shock of fall from a height of 75 cm. However, the shock power of IC inserters

might destroy resonators. It depends on the machines and conditions at your Company. We

recommended to adjust the machine conditions before mass production.

2. The notice for soldering differs in DIP product and SOP product.

• DIP Product

Since the eutectic solder (melting point 183°C) is used for soldering the crystal resonator,

destruction of crystal resonator or degradation of characteristics of resonators can be

induced by high temperature (more than 150°C) inside the package. Soldering with

solder dip bath or manual soldering is recommendable. Please refrain from soldering by

hot air, reflow, infrared rays, etc. Soldering heat resistance test conditions : 260°C x 10

seconds. (Soldering for the lead must leave 1 mm from its base.)

• SOP Product

Soldering by hand or soldering by infrared ray reflow based on the temperature profile

of our Company’s recommendation is desirable. (Refer to "Package information.)

3. The ultrasonic washing may damage the crystal resonator due to the use conditions.

Therefore, we can not guarantee your use for the ultrasonic washing because of unknown

factors about a kind of washing machine, electric power, hour, place to be set in a bath, etc.

Be sure to confirm the use conditions before your use as well as with condition change when

you have to use the ultrasonic washing machine unavoidably.

(The ultrasonic washing machine of frequency 40 kHz can not be used for built-in the tuning

- fork resonator of 32.768 kHz, but the one of frequency 28 kHz has the range available due

to the conditions. However, be sure to confirm the setting conditions sufficiently for the

abovementioned reasons.)

4. Please keep parts free from dew.

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