IC-MG_14 Datasheet, PDF (19/22 Pages) IC-Haus GmbH – 8-Bit Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MG
8-Bit Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
ERROR MONITORING and ALARM OUTPUT
Rev D1, Page 19/22
iC-MG monitors input signals, the internal interpolator
and the controlled sensor supply via which the input
signal levels are stabilized. Should the sensor supply
tracking reach control limits this can be interpreted as
an end-of-life message, for example.
Two separate error masks determine whether error
events cause the RS422 output drivers to shutdown
(mask EMASKO) or are signaled as an alarm via
the current-limited open drain I/O pin NERR (mask
EMASKA).
The display logic and minimum indication time are
settable; an internal pull-up current source can be
switched in. At the same time pin NERR has an input
function to trigger a new configuration run (see Serial
EEPROM Interface).
EMASKA
Bit
8
7
6*
5
4
3
2
1
0
Code
1
0
Notes
Adr 0x15, bit 0; Adr 0x14, bit 7:0
Error event
Temporal tracking error (out-of-sync: position output
differs from actual angle, e.g. after cycling power)
Loss of tracking due to excessive input frequency
Configuration error
(SDA or SCL pin error, no acknowledge signal from
EEPROM or invalid check sum)
Excessive temperature warning
Ungated index enable signal Zin
PWR control out of range (at max. limit)
PWR control out of range (at min. limit)
Signal clipping (excessive input level)
Loss of signal (poor differential level**, wrong s/c
phase)
Function
Enable: event changes state of pin ERR
(if EMASKO does not disable the output function).
Disable: event does not affect pin ERR.
*) Pin ERR can not pull low on configuration error,
use high-active error logic instead (EPH = 1);
**) Also due to excessive input signals or internal
signal clipping.
Table 39: Error Event Mask for Alarm Output
EPH
Code
0*
1
Notes
Addr 0x15, bit 2
State on error
State w/o error
active low
high impedance,
with input function for a
low-active system error;
high impedance
active low
*) Pin ERR is disabled during driver shutdown and
cannot indicate errors in this case.
Table 36: Alarm Output Logic
Driver Shutdown
Driver shutdown is a precaution to protect iC-MG. Pin
PWR is set to the 5 mA range, the line drivers and pin
ERR are tristate during driver shutdown.
Driver shutdown due to overheating or due to a con-
figuration error is always enabled. Configuration errors
are SDA or SCL pin error, no acknowledge signal from
EEPROM or invalid checksum. EMASKO is used pro-
gram driver shutdown due to other error events.
EMTD
Code
0x0
0x1
0x2
0x3
Adr 0x15, bit 5:3
Indication time
0 ms
12.5 ms
25 ms
37.5 ms
Code
0x4
0x5
0x6
0x7
Indication time
50 ms
62.5 ms
75 ms
87.5 ms
Table 37: Minimal Alarm Indication Time
EPU
Code
0
1
Adr 0x17, bit 2
Function
No internal pull-up active
Internal 300 µA pull-up source active
Table 38: Alarm Output Pull-Up Enable
EMASKO
Bit
8
7
6
5
4
3
2
1
0
Code
1
0
Notes
Adr 0x17, bit 0; Adr 0x16, bit 7:0
Error event
Temporal tracking error (out-of-sync: position output
differs from actual angle, e.g. after cycling power)
Loss of tracking due to excessive input frequency
(Configuration error, always enabled)
Excessive temperature warning
System error: I/O pin NERR pulled to low by an
external error signal (only permitted with EPH = 0)
PWR control out of range (at max. limit)
PWR control out of range (at min. limit)
Signal clipping (excessive input level)
Loss of signal (poor differential level**, wrong s/c
phase)
Function
Enable: event causes a driver shutdown
Disable: output drivers remain active
**) Also due to excessive input signals or internal
signal clipping.
Table 40: Error Event Mask for Driver Shutdown