iC-NQC
13-bit Sin/D CONVERTER WITH SIGNAL CALIBRATION
Rev D1, Page 17/29
SIGNAL MONITORING and ERROR MESSAGES
Vss
SELAMPL Adr 0x0C, Bit 2
AMPL Adr 0x0C, Bit 1:0
Max ( |Sin| , |Cos| ) for SELAMPL = 0
Vth
Code
0x00
0x01
0x02
0x03
Voltage threshold Vth
0.60 x VDDA
Output amplitude*
1.4 Vpp
0.64 x VDDA
2.0 Vpp
0.68 x VDDA
2.6 Vpp
0.72 x VDDA
3.1 Vpp
Sin2 + Cos2 for SELAMPL = 1
Figure 13: Signal monitoring at minimum amplitude.
Code
0x04
0x05
0x06
0x07
Notes
Vthmin ↔ Vthmax
Output amplitude*
1.0 Vpp ↔ 4.5 Vpp
1.5 Vpp ↔ 4.5 Vpp
2.0 Vpp ↔ 4.5 Vpp
2.5 Vpp ↔ 4.5 Vpp
Vthmax
Vthmin
(0.20 ↔ 0.9) x VDDA
(0.30 ↔ 0.9) x VDDA
(0.40 ↔ 0.9) x VDDA
(0.50 ↔ 0.9) x VDDA
Vth, Vthmin, Vthmax are typical values; refer to Elec.
Char. No. H01 cf. for maximal values.
*) Entries are calculated with VDDA = 5 V.
Figure 14: Sin2 + Cos2 signal monitoring.
Table 24: Signal amplitude monitoring
AERR
Code
0x00
Adr 0x03, Bit 1
Amplitude error message
disabled
Error Messages
Failure Mode
Error bits E1, E0
for BiSS and SSI
CRC6 = 0
Error bits nE, nW
for BiSS and SSI
CRC6 = 1
0x01
enabled
No error
1, 1
0, 1
1, 0
0, 0
—
1, nW
0, nW
0, nW
0, nW
nE, 0
Amplitude error
Frequency error
System error*
Warning**
Table 25: Amplitude error
FERR
Code
0x00
Adr 0x03, Bit 0
Excessive frequency error message
Notes
disabled
enabled
*System error
**Warning
NERR pulled low by external signal
Automatic step-back of resolution
0x01
Notes
Input frequency monitoring is operational for
resolutions ≥ 16
Line Signal SLO
Data output is deactivated and SLO
permanently high in case of: configuration
phase, invalid configuration, undervoltage.
Table 26: Frequency error
Table 29: Error messages
Configuration error
Always enabled
-
To enable the diagnosis of faults, the various types
of error are signaled at NERR using a PWM code as
given in the key on the left.
Table 27: Configuration error
Error Indication at NERR
Two error bits are provided to enable communication
via the I/O interface; these bits can decode four differ-
ent types of error. If NERR is held at low by an external
source, such as an error message from the system, for
example, this can also be verified via the I/O interface.
Failure Mode
No error
Pin signal NERR
HI
Amplitude error
Frequency error
Configuration
Undervoltage
System error
LO/HI = 75 % (resp. HI for AERR = 0)
LO/HI = 50 % (resp. HI for FERR = 0)
LO
LO
NERR = low caused by an external error
signal
Error are stored until the sensor data is output via the
I/O interface and then deleted. Errors at NERR are
displayed for a minimum of ca. 10 ms unless they are
deleted beforehand by a data output.
Table 28: Error indication at NERR
ICHAUS [ IC-HAUS GMBH ]
