Multimeter ICs/Cyrustek ES51919

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The Cyrustek 51919 is used in LCR meters. The chip takes no commands, and continually outputs 17-byte packets structured as described below.

Byte Description
0-1 Header, always 0x00 0x0d
2 Flags
0 hold enabled
1 reference shown (in delta mode)
2 delta mode
3 calibration mode
4 sorting mode
5 LCR mode
6 auto mode
7 parallel measurement (vs. serial)
3 Configuration
0-4 unknown
5-7 test frequency
0 100 Hz
1 120 Hz
2 1 KHz
3 10 KHz
4 100 KHz
5 0 Hz (DC)
4 Tolerance (sorting mode)
0 not set
3 ±0.25%
4 ±0.5%
5 ±1%
6 ±2%
7 ±5%
8 ±10%
9 ±20%
10 -20+80%
5-9 Primary measurement
10-14 Secondary measurement
15-16 Footer, always 0x0d 0x0a