IC-HT datasheet(30/42 Pages) ICHAUS

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iC-HT

DUAL CW LASER DIODE DRIVER

Rev A1, Page 30/42

WATCHDOG TIMER

The internal 200 kHz oscillator is monitored with the

Watchdog Timer (WDT).

If the oscillator remains longer than the maximum time

of tWDT (cf. Electrical Characteristics No. E03) with-

out activity an oscillator error is triggered. An oscillator

error sets OSCERR error bit to 1. The automatic offset

compensation of the laser control requires the oscilla-

tor.

The state of OSCERR is signaled at pin NCHK. The

signaling of OSCERR state can be masked with bit

MOSCERR. Setting MOSCERR to 1 masks the oscil-

lator error and OSCERR will not be signaled at NCHK.

It is possible to simulate an error of the oscillator us-

ing SOSCERR bit. If SOSCERR = 1, the oscillator er-

ror is forced. When OSCERR is set to 1 the error will

be signaled through NCHK, depending on the state of

MOSCERR.

OSCERR

Addr. 0x00; bit 6

Oscillator operates OK

Watchdog timeout set, oscillator fail. Cleared on

read

Table 58: Oscillator error

MOSCERR

Addr. 0x1D; bit 0

R/W 0

Oscillator error (watchdog) will be signaled at

NCHK

Oscillator error (watchdog) will not be signaled at

NCHK

Table 59: Oscillator error mask

SOSCERR

Addr. 0x1D; bit 7

R/W 0

No oscillator error simulated.

Oscillator error simulated (watchdog timeout).

Table 60: Simulate oscillator error

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