STC8A8K64D4 Series Manual
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7.4.2 Interpretation of the internal reference signal source in CHIP
Internal 1.19V reference signal source (high byte)
Internal 1.19V reference signal source (low byte)
[CHIPID7, CHIPID8]: 16-bit internal reference signal source voltage value (higher bit first).
The standard value is 1190 (04A6H), and the unit is mV, which is 1.19V. But there is error in the actual chip due to
manufacturing errors. The voltage value of the internal reference signal source is not affected by the working voltage VCC,
so the internal reference signal source can be combined with the ADC to calibrate the ADC, and can also be combined with
the comparator to detect the operating voltage.
7.4.3 Interpretation of internal 32K IRC oscillation frequency in CHIP
32K Power-down wake-up timer frequency(high byte)
32K Power-down wake-up timer frequency (low byte)
[CHIPID9, CHIPID10]: 16-bit 32K IRC oscillator frequency value (higher bit first).
The standard value is 32768 (8000H), the unit is Hz, that is, 32.768KHz. However, the actual chip has manufacturing
errors, and the temperature drift and pressure drift are relatively large.
The voltage drift test linear diagram and temperature drift linear diagram of the internal 32K oscillator are as follows:
7.4.4 Interpretation of high precision IRC parameters in CHIP
IRC parameter of 22.1184MHz (27M band)
IRC parameter of 24MHz (27M band)
IRC parameter of 20MHz (27M band)
IRC parameter of 27MHz (27M band)
IRC parameter of 30MHz (27M band)
IRC parameter of 33.1776MHz (27M band)
IRC parameter of 35MHz (44M band)
IRC parameter of 36.864MHz(44M band)
IRC parameter of 40MHz(44M band)
15000
20000
25000
30000
35000
40000
5.0 4.5 4.0 3.5 3.0 2.5
15000
20000
25000
30000
35000
40000
45000
50000
55000
-40 -20 0 25 45 65 85
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