IC-MSA Datasheet, PDF (25/29 Pages) IC-Haus GmbH – SIN/COS SIGNAL CONDITIONER with AGC and 1Vpp DRIVER

iC-MSA SIN/COS SIGNAL
preliminary
CONDITIONER with AGC and 1Vpp DRIVER
ERROR MONITORING AND ALARM OUTPUT
Rev A1, Page 25/29
The following table gives the errors which can both be
recognized by iC-MSA and enabled either for messag-
ing, output shutdown or protocol in the EEPROM.
Mask EMASKA stipulates that errors should be sig-
naled at pin ERR, mask EMASKO determines whether
the line drivers are to be shutdown or not (with
PDMODE defining reactivation) and mask EMASKE
governs the storage of error events in the EEPROM.
EMASKA
EMASKO
EMASKE
Bit
6*
5
4
3
2
1
0
Addr 0x54, bit 6:0
Addr 0x56, bit 6:0
Addr 0x58, bit 2:0; Addr 0x57, bit 7:4
Error Event
Configuration error (SDA or SCL pin error, no Ack
signal from EEPROM or invalid check sum);
EMASKO(6) = 1 (ROM bit): The line drivers remain
high impedance (tristate) when cycling power.
Excessive temperature warning
External system error
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)
EMASKA
1
0
EMASKO
1
0
EMASKE
1
0
Notes
Error Mask Alarm Output ERR
Enable: event changes state of pin ERR
(if EMASKO does not disable the output function).
Disable: event does not affect pin ERR.
Error Mask Driver Shutdown
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
Error Mask EEPROM Savings
Enable: event will be latched
Disable: event will not be latched
*) 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.
EPH
Code
0
1
Addr 0x55, bit 2
State on error
active low
high impedance
State w/o error
high impedance,
with input function for a
low-active system error;
active low
Table 41: I/O Logic, Alarm Output ERR
EMTD
Code
0x0
0x1
0x2
0x3
Addr 0x55, 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 42: Min. Indication Time, Alarm Output ERR
EPU
Code
0
1
Addr 0x57, bit 2
Function
No internal pull-up
Internal 300 µA pull-up current source active
Table 43: Pull-Up Enable, Alarm Output ERR
Excessive Temperature Warning
Exceeding the temperature warning threshold T_w (cor-
responds to T₂, refer to Tempeprature Sensor, page
15) can be signaled at pin ERR or used to shut down
the line drivers (via mask EMASKO). The temperature
warning is cleared when the temperature falls below
T_w -T_hys.
Notice: If the temperature shutdown threshold T_off =
T_w + ∆ T is exceeded, the line drivers are shut down
independently of EMASKO. For ∆ T refer to Elec.
Char. E06.
Driver Shutdown
Table 40: Error Masking
Alarm Output: I/O pin ERR
Pin ERR is operated by a current-limited open drain
output driver and has an internal pull-up which can be
shutdown. The ERR pin also acts as an input for exter-
nal system error messaging and for switching iC-MSA
to test mode for which a voltage of greater than VTMon
must be applied. Interpretation of external system er-
ror messaging and the phase length of the message
output can be set using EPH; the minimum signaling
duration for internal errors is adjusted using EMTD.
PDMODE
Code
0
1
Addr 0x58, bit 6
Function
Line driver active when no error persists
Line driver active after power-on
Table 44: Driver Activation
Error Protocol
Out of the errors pinpointed by EMASKE both the first
(under ERR1) and last error (under ERR2) which occur
after the iC-MSA is turned on are stored in the EEP-
ROM.