IC-PI datasheet(40/49 Pages) ICHAUS

40 / 49 page

preliminary

iC-PI PROGRAMMABLE 12-BIT

Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

Rev B1, Page 40/48

Excessive Temperature Warning

Exceeding the temperature warning threshold Tw (cor-

responds to T2, refer to Temperature Sensor, page

20) can be signaled at pin ERR or used to shut down

the output drivers (via mask EMASKO). The tempera-

ture warning is cleared if the temperature falls below

Tw –Thys.

Note: If the temperature shutdown threshold Toff =

Tw + ∆ T is exceeded, the output drivers are shut

down independently of EMASKO. For ∆ T refer to

Elec. Char. E07.

Configuration Error

The chip’s internal configuration registers (RAM ad-

dresses 0x00 to 0x2E) are permanently reviewed and

verified by the checksum CHKSUM stored at address

0x2F. If the CRC verification fails, the configuration error

will be asserted (as also when the initial configuration

from the EEPROM fails).

Output Driver Shutdown

Output driver shutdown is a precaution to protect iC-PI.

During shutdown, the output drivers and pin ERR are

tristate, and the output current range for pin ACO is

reset to the 5 mA range.

Driver shutdown due to overheating or due to a config-

uration error is always enabled. Configuration errors

are SDA or SCL pin error, no acknowledge signal from

EEPROM or invalid checksum. EMASKO is used to

configure driver shutdown due to other error events.

PDMODE

Addr. 0x1A, bit 6

Code

Function

Driver shutdown terminates with the error event

Permanent driver shutdown until cycling power

Table 66: Driver Activation

EMASKO

Addr. 0x1A, bit 1:0; Addr. 0x19, bit 7:0

Bit

Error event

9:0

Refer to the description of EMASKA.

Code

Function

Enable: event causes a driver shutdown

Disable: output drivers remain active

Table 67: Error Mask Driver Shutdown

Error Logging

Error information can be stored in the EEPROM. Only

errors enabled by EMASKE are logged. The first error

in the lifetime of the product is stored in ERRFIRST.

The latest occurred error is stored in ERRACT.

The EEPROM has an additional memory area in which

all errors are accumulated (ERRACC). Only errors en-

abled by EMASKE are logged and only the fact that this

error has occurred is logged, with no information as to

the time and count of appearance of that error given.

Error logging can be used to statistically evaluate the

causes of system failure, for example.

iC-PI enters standby and the output drivers are shut

down if an I2C communication error occurs while writing

to the EEPROM. iC-PI can be reenabled with bit RUN

if EMASKO(6) is zero.

EMASKE

Addr. 0x1C, bit 1:0; Addr. 0x1B, bit 7:0

Bit

Error event

9:0

Refer to the description of EMASKA.

Code

Function

Enable: event will be logged.

Disable: event will not be logged.

Table 68: Error Mask EEPROM Savings

Note: The GUI’s Error Display can only be used,

when events of interest are enabled using EMASKE().

ERRFIRST

Addr. 0x31, bit 1:0; Addr. 0x30, bit 7:0

ERRACT

Addr. 0x32, bit 3:0; Addr. 0x31, bit 7:2

ERRACC

Addr. 0x33, bit 5:0; Addr. 0x32, bit 7:4

Bit

Error Event

9:0

Assignation according to EMASKA

Code

Function

No event

Logged error event

Table 69: Error Protocol

Clearing Errors

Using an external I2C master device connected to the

I2C bus, the error information in the RAM and in the

EEPROM (ERRFIRST, ERRACT, and ERRACC on ad-

dresses 0x31 to 0x33) can be cleared at any time. How-

ever, if an error condition is active in the iC-PI which

is enabled to be logged, iC-PI will update the error

memory as soon as the I2C bus is available again.

Note: Any write access to change a parameter will

trigger a configuration error, which persists until the

checksum CHKSUM was adapted. When using error

logging, also the error memory needs to be cleared

finally.

Note: Setting RUN = 0 does not stop iC-PI’s error

management completely, but stops the incremental

engine and thus the generation of a line count error, a

tracking error and an excessive input frequency error

(registers ERRxxx(9:7)).

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