M48T59-70PC1(2008) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M48T59-70PC1
(Rev.:2008)

5.0 or 3.3 V, 64 Kbit (8 Kbit x 8) TIMEKEEPER® SRAM

STMicroelectronics 

M48T59, M48T59Y, M48T59V

Figure 8. Crystal accuracy across temperature

Clock operations

Frequency (ppm)

20

0

–20

–40

–60

–80

–100

–120

F

= -0.038

ppm

C2

(T

-

T0)2

±

10%

T0 = 25 °C

–140

) –160

duct(s –40 –30 –20 –10 0

10 20 30 40 50 60 70 80

Temperature °C

AI00999

Pro Figure 9. Clock calibration

lete NORMAL

bso POSITIVE

O CALIBRATION

t(s) - NEGATIVE

uc CALIBRATION

AI00594B

Prod 3.5

Setting the alarm clock

leteRegisters 1FF5h-1FF2h contain the alarm settings. The alarm can be configured to go off at

o a prescribed time on a specific day of the month or repeat every month, day, hour, minute, or

s second. It can also be programmed to go off while the M48T59/Y/V is in the battery back-up

Ob mode of operation to serve as a system wake-up call.

Bits RPT1-RPT4 put the alarm in the repeat mode of operation. Table 6 on page 16 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.

Note:

User must transition address (or toggle chip enable) to see Flag Bit change.

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

defined by RPT1-RPT4, AF (Alarm Flag) is set. If AFE (Alarm Flag Enable) is also set, the

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