iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev D4, Page 30/39
ERROR MONITORING AND ALARM OUTPUT
EMASKA
Adr 0x15, bit 1:0; Adr 0x14, bit 7:0
Error event
iC-MQ monitors the input signals, the internal interpo-
lator and the sensor supply controller via which the in-
put signal levels are stabilized. If the sensor supply
tracking unit reaches its control limits this can be inter-
preted as an end-of-life message, for example.
Bit
9
Line count error (wrong count of sine periods
between two zero pulses)
8
Temporal tracking error (out-of-sync: position output
differs from actual angle, e.g. after cycling power)
7
6
Loss of tracking (excessive input frequency)
Three separate error masks stipulate whether error
events are signaled as an alarm via the current-limited
open drain I/O pin ERR (mask EMASKA), whether they
cause the RS422 line drivers to shutdown or not (mask
EMASKO) or whether they are stored in the EEPROM
(mask EMASKE).
Configuration error*
(SDA or SCL pin error, no acknowledge signal from
EEPROM or invalid check sum)
5
4
Excessive temperature warning
Ungated index enable signal ZIn
(comparated X1/X2 inputs for CFGABZ and
CFGZPOS adjustment)
3
2
1
0
Control error 2: range at max. limit
The display logic (via EPH) and the minimum alarm in-
dication time (via EMTD) can be set for I/O pin ERR; an
internal pull-up current source can be switched in via
EPU. ERR pin also has an input function for switching
iC-MQ to test mode (see page 33) and for the accep-
tance of a system error message in normal operation
(only for EPH = 0).
Control error 1: range at min. limit
Signal error 2: clipping due to excessive input level
Signal error 1: loss of signal (poor input level or s/c
phase out of range)
Code
1
Function
Enable: event will be displayed
Disable: event will not be displayed
0
Notes
*) The line drivers remain high impedance (tristate)
when cycling power.
EPH
Code
0
Adr 0x15, bit 2
Pin Logic
Low on error (otherwise Z)
Z on error (otherwise low)
Table 57: Error Event Mask for Alarm Output
1
EMASKO
Adr 0x17, bit 1:0; Adr 0x16, bit 7:0
Error event
Table 53: Alarm Input/Output Logic
Bit
9
Line count error (wrong count of sine periods
between two zero pulses)
EMTD
Code
0x0
Adr 0x15, bit 5:3
Indication Time
0 ms
Code
0x4
0x5
0x6
0x7
Indication Time
50 ms
8
Temporal tracking error (out-of-sync: position output
differs from actual angle, e.g. after cycling power)
7
6
Loss of tracking (excessive input frequency)
0x1
12.5 ms
25 ms
62.5 ms
75 ms
Configuration error* (ROM bit with fixed value = 1)
SDA or SCL pin error, no acknowledge signal from
EEPROM or invalid check sum
0x2
0x3
37.5 ms
87.5 ms
5
4
Excessive temperature warning
Table 54: Minimum Alarm Indication Time
System error: I/O pin ERR pulled to low by an
external error signal (only permitted with EPH = 0)
EPU
Code
0
Adr 0x17, bit 2
3
2
1
0
Control error 2: range at max. limit
Function
Control error 1: range at min. limit
No internal pull-up active
Internal 300 µA pull-up current source active
Signal error 2: clipping due to excessive input level
1
Signal error 1: loss of signal (poor input level or s/c
phase out of range)
Code
1
Function
Table 55: Pull-Up Enable for Alarm Output ERR
Enable: event triggers tri-state
Disable: event does not cause tri-state
0
PDMODE
Adr 0x18, bit 6
Notes
*) The line drivers remain high impedance (tristate)
when cycling power.
Code
Function
0
1
Line driver active when no error persists
Line driver active only after cycling power
Table 58: Error Event Mask for Driver Shutdown
Table 56: Driver Activation
ICHAUS [ IC-HAUS GMBH ]
