M41ST87YSS6F datasheet(33/52 Pages) STMICROELECTRONICS

部件名	M41ST87YSS6F

功能描述	5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM

PDF	52 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

33 / 52 page

M41ST87Y, M41ST87W

Clock operation

Doc ID 9497 Rev 8

33/52

Figure 22.

Crystal accuracy across temperature

Figure 23.

Calibration waveform

3.3

Setting alarm clock registers

Address locations 0Ah-0Eh contain the alarm settings. The alarm can be configured to go

off at a prescribed time on a specific month, date, hour, minute, or second, or repeat every

year, month, day, hour, minute, or second. It can also be programmed to go off while the

M41ST87Y/W is in the battery back-up to serve as a system wake-up call.

Bits RPT5–RPT1 put the alarm in the repeat mode of operation. Table 8 on page 34 shows

the possible configurations. Codes not listed in the table default to the once per second

mode to quickly alert the user of an incorrect alarm setting.

When the clock information matches the alarm clock settings based on the match criteria

defined by RPT5–RPT1, the AF (alarm flag) is set. If AFE (alarm flag enable) is also set, the

AI07888

–160

10203040506070

Frequency (ppm)

Temperature

°C

–10

–20

–30

–40

–100

–120

–140

–40

–60

–80

–20

= –0.036 ppm/

°C

2 ± 0.006 ppm/°C2

= K x (T – T

O = 25°C ± 5°C

AI00594B

NORMAL

POSITIVE

CALIBRATION

NEGATIVE

CALIBRATION

M41ST87YSS6F 数据表(PDF) 33 Page - STMicroelectronics

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