ST52T301 datasheet(50/100 Pages) STMICROELECTRONICS

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and Figure 10.11), is introduced after each firing

pulse (see Figure 10.7):

Masking time =(2^TCMSK*200 +100) nS.

If TCMSK is 0 then Masking time is 0.

In fact, to avoid the detection of electrical noise,

during the masking time no signal, coming from

MAIN1 and MAIN2, is taken into account.

Working in the II and III quadrant the peripheral

implements the following procedure:

1) The firing pulse is set to ”1” on the rising edge of

MAIN1.

2) The firing pulse is reset to ”0” after the time Tp

fixed by program.

3) The firing pulse is reset to ”0” for a time equal to

the fixed masking time.

4) On the falling edge of MAIN2 the firing pulse is

set to ”1”

5) The firing pulse is reset to ”0” after the time Tp

fixed by program.

6) The firing pulse is reset to ”0” for a time equal to

the fixed masking time.

Following this approach it is possible to filter

electrical noise and oscillations on the signal

MAIN1 and MAIN2.

It is possible to generate a programmable Interrupt

in four different ways:

1) No Interrupt;

2) Interrupt on the rising edge of the signal Tb.

3) Interrupt on the falling edge of the signal Tb.

4) Interrupt on both the edge of the signal Tb.

The Interrupt is programmable by using the register

REG_CONF11(7:6), INTSL (see Table 10.5).

(1.5)

(1)

(0.5)

0.5

1.5

(1.5)

(1)

(0.5)

0.5

1.5

A2-A1

180

360

Phase Angle

Current Flow Angle

Loa d

Figure 10.8. Phase Angle Partialization Mode

10.3 PHASE ANGLE PARTIALIZATION WORK-

ING MODE

When REG_CONF10 (3:2) bits, MODE, are ”11”

the peripheral is programmed to work in PHASE

ANGLE PARTIALIZATION mode.

In this mode Triac is controlled each period of the

main voltage. The power transferred to the load is

proportional to the CURRENT FLOW ANGLE

γ.

This kind of Triac control is suitable to drive the Triac

TCMSK

Masking Time

0000

µs

0001

0.5

µs

0010

0.9

µs

0011

1.7

µs

0100

3.3

µs

0101

6.5

µs

0110

12.9

µs

0111

25.7

µs

1000

51.3

µs

1001

102.5

µs

1010

204.9

µs

1011

409.7

µs

1100

819.3

µs

1101

1638.9

µs

1110

3276.9

µs

1111

6553.7

µs

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