M41T93RMY6F datasheet(42/56 Pages) STMICROELECTRONICS

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Clock operation

M41T93

42/56

DocID12615 Rev 8

3.15

Initial power-on defaults

Upon initial application of power to the device, the register bits will initially power-on in the

state indicated in Table 13 and Table 14.

Table 13. Initial power-on default values (part 1)

Table 14. Initial power-up default values (part 2)

3.16

OTP bit operation (SOX18 package only)

Using the factory-supplied analog calibration value

When the OTP (one time programmable) bit is set to a 1, the factory calibration value in the

internal OTP register will be transferred to the analog calibration register (12h) and is “read

only.” The OTP value is programmed by the manufacturer, and will contain the value

necessary to achieve typically ±5 ppm(a) (VCC only) at room temperature after two SMT

reflows. This clock accuracy can be guaranteed to drift no more than ±3 ppm the first year,

and ±1 ppm for each following year due to crystal aging.

If the OTP bit is set to 0, the analog calibration register will become a WRITE/READ register

and function like an ordinary register, allowing the user to implement any desired value of

analog calibration.

When the user sets the OTP bit, they need to wait for approximately 8 ms before the analog

registers transfer the value from the OTP to the analog registers due to the OTP read

operation.

Condition(1)

1. All other control bits power-up in an undetermined state

ST CB1 CB0 OUT FT

DCS

ACS

Digital

calib.

Analog

calib.

OFIE Watchdog(2)

2. BMB0-BMB4, RB0, RB1

A1IE SQWE ABE

Initial

power-up

Subsequent

power-up(3)(4)

3. With battery backup

4. UC = Unchanged

Condition(1)

1. All other control bits power-up in an undetermined state

RPT11-15 HT

TI/TP TIE TD1 TD0 RS0 RS1-3 OTP RPT21-25

AL2E

Initial

power-up

Subsequent

power-up (2)(3)

2. With battery backup

3. UC = Unchanged

a. Max. value = +12 ppm / –5 pmm based on limited data

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