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參數(shù)資料
| 型號： | M41T93ZQA6F |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PQCC16 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁數(shù)： | 18/49頁 |
| 文件大小： | 719K |
| 代理商： | M41T93ZQA6F |
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M41T93
Clock operation
Doc ID 12615 Rev 5
Two methods are available for ascertaining how much calibration a given M41T93 may
require:
●
The first involves setting the clock, letting it run for a month and comparing it to a known
accurate reference and recording deviation over a fixed period of time. This allows the
designer to give the end user the ability to calibrate the clock as the environment
requires, even if the final product is packaged in a non-user serviceable enclosure. The
designer could provide a simple utility that accesses either or both of the calibration
bytes.
●
The second approach is better suited to a manufacturing environment, and involves the
use of the IRQ/FT/OUT pin. The IRQ/FT/ OUT pin will toggle at 512 Hz when FT and
OUT bits = '1' and ST = '0.' Any deviation from 512 Hz indicates the degree and
direction of oscillator frequency shift at the test temperature. For example, a reading of
512.010124 Hz would indicate a +20 ppm oscillator frequency error, requiring either a
–10 (xx001010) to be loaded into the digital calibration byte, or +6 pF (00011000) into
the analog calibration byte for correction.
Note:
Setting or changing the digital calibration byte does not affect the frequency test, square
wave, or watchdog timer frequency, but changing the analog calibration byte DOES affect all
functions derived from the low current oscillator (see Figure 12).
Figure 12.
Clock divider chain and calibration circuits
AI11806a
Analog Calibration
Circuitry
Remainder of
Divider Circuit
1Hz Signal
512Hz Output
Frequency Test
32KHz
Low Current
Oscillator
CXI
CXO
÷2
÷8
÷2
Digital Calibration Circuitry
(divide by 511/512/513)
Clock
Registers
Square Wave
Watchdog Timer
8-Bit Timer
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| M41T93RQA6F | 1 TIMER(S), REAL TIME CLOCK, PQCC16 |
| M41T93SQA6F | 1 TIMER(S), REAL TIME CLOCK, PQCC16 |
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| M43C505-XXX-Q44 | 4-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC44 |
| M44C090-XXX-FL16 | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDSO16 |
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