IC-HTP datasheet(36/51 Pages) ICHAUS

36 / 51 page

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iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

Rev B1, Page 36/51

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) without

activity an oscillator error is triggered. An oscillator er-

ror sets OSCERR error bit to 1. The automatic offset

compensation of the laser control requires the oscillator.

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 oscilla-

tor error and OSCERR will not be signaled at NCHK.

It is possible to simulate an error of the oscillator using

SOSCERR bit. If SOSCERR = 1, the oscillator error

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 functioning OK

Watchdog timeout set on oscillator failure.

Cleared on read

Table 73: Oscillator watchdog

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 74: Oscillator watchdog error mask

SOSCERR

Addr. 0x1D; bit 7

R/W 0

No oscillator error simulated

Oscillator error simulated (watchdog timeout)

Table 75: Simulate oscillator error

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