IC-MQF Datasheet, PDF (31/37 Pages) IC-Haus GmbH – PROGRAMMABLE 12-BIT Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MQF PROGRAMMABLE 12-BIT ^preliminary
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev A1, Page 31/37
Exceeding the temperature warning threshold can be
signaled at pin ERR or used to shut down the line
drivers (via mask EMASKO). The temperature warn-
ing is deleted when the temperature drops below T_w
-T_hys .
Error Protocol
Out of the errors enabled by EMASKE both the first
(under ERR1) and last error (under ERR2) which occur
after the iC-MQF is turned on are stored in the EEP-
ROM.
Excessive Temperature Shutdown
If the temperature shutdown threshold T_off = T_w + ∆ T
is exceeded the line drivers are shut down independent
of EMASKO.
Driver Shutdown
The EEPROM also has a memory area in which all oc-
curring errors can be stored (ERR3). Only the fact that
an error has occurred can be recorded, with no infor-
mation as to the time and count of appearance of that
error given. Error recording can be used to statistically
evaluate the causes of system failure, for example.
PDMODE
Code
0
1
Addr 0x1A, bit 6
Function
Driver shutdown terminates with the error event
Permanent driver shutdown until cycling power
Table 55: Driver Activation
EMASKO
Bit
9
8
7
6*
5
4
3
2
1
0
Code
1
0
Notes
Addr 0x1A, bit 1:0; Addr 0x19, bit 7:0
Error event
Line count error (wrong count of sine periods
between two zero pulses)
Temporal tracking error (out-of-sync: position output
differs from actual angle, e.g. after cycling power)
Loss of tracking (excessive input frequency)
Configuration error (ROM bit fix on 1)
SDA or SCL pin error, no acknowledge signal from
EEPROM or invalid check sum
Excessive temperature warning
System error: I/O pin ERR pulled to low by an
external error signal (only permitted with EPH = 0)
Control error 2: range at max. limit
Control error 1: range at min. limit
Signal error 2: clipping
Signal error 1: loss of signal (poor differential
amplitude**, wrong s/c phase)
Function
Enable: event resets pin ACO to the 5 mA range,
tristates the line driver outputs and pin ERR (i.e.
low-active error messages can not be displayed)
Disable: output functions remain active
*) The configuration error is always enabled.
**) Also due to excessive input signals or internal
signal clipping.
Table 56: Error Mask Driver Shutdown
EMASKE
Bit
9
8
7
6
5
4
3
2
1
0
Code
1
0
Addr 0x1C, bit 1:0; Addr 0x1B, bit 7:0
Error event
Line count error
—
Loss of tracking
—
Excessive temperature warning
System error
Control error 2
Control error 1
Signal error 2
Signal error 1
Function
Enable: event will be latched
Disable: event will not be latched
Table 57: Error Mask EEPROM Savings
ERR1
ERR2
ERR3
Bit
6:0
Code
0
1
Addr 0x31, bit 1:0; Addr 0x30, bit 7:0
Addr 0x32, bit 3:0; Addr 0x31, bit 7:2
Addr 0x33, bit 5:0; Addr 0x32, bit 7:4
Error Event
Assignation according to EMASKE
Function
No event
Registered error event
Table 58: Error Protocol