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AS8579-ASST Datasheet(PDF) 18 Page - OSRAM GmbH

Part # AS8579-ASST
Description  Capacitive Sensor
PDF  44 Pages
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Manufacturer  OSRAM [OSRAM GmbH]
Direct Link  http://www.osram.com
Logo OSRAM - OSRAM GmbH

AS8579-ASST Datasheet(HTML) 18 Page - OSRAM GmbH

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AS8579
Functional Description
Datasheet
• PUBLIC
DS000707
• v4-01 • 2022-Jun-08
43
│ 17
bit is set in the SPI Status register. In case of this error, the chip cannot guarantee the correct
synchronization between SPI clock and MCLK.
SM11 CBF
The safety mechanism Current Buffer Fail is monitoring the output voltage of the current-to-voltage
buffer. The sensor provides an error flag CBF=1 in Status Register when the output voltage is lower
than voltage threshold CBF_L or higher than voltage threshold CBF_H.
SM12 PPSF
The Pin-to-Pin Short diagnostic is realized with a pin-to-pin DC resistance measurement. For the pair
of pins being tested, the main MUX is set to MODE=0 (open). Two diagnostic MUX can route any of
the 11 tested pins (SEN lines & VAR_SEN to a comparator) programmed by PLUS/MINUS register
(0x2C/0x3C), referenced by a resistive divider. In case the resistance is too low, the PPSF Flag is
going high.
6.1.3
Blanking Error Flags
Each Safety Mechanism has its own Up/Down Counter (individually blanked). See 7.2.2 Status
Register or 6.1.1 Safety Mechanism Overview for details on which diagnostic needs blanking. The
0x2B command is used to read the current value of the BLANK register. The counters are clocked
from a signal synchronous with the transmitter sine wave. Effectively each Diagnostic is checked once
per sine cycle. The diagnostic bits in the Status Register which need blanking, do not clear when Error
is disappearing. They are latched until the Status Register is read through SPI.
Figure 12:
Example Diagnostic Maturity Using Blanking
Description in chapter “Diagnostic Blanking Register (Address 0x2B/0x3B)
Fault detected (analog)
Clock - ZC
0000
1111
1110
1101
1100
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
Fault Status Bit
Fault matured



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