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4964B–AUTO–07/07

ATA6842

For operation of SPI communication see the following timing diagrams (see Figure 7-2 and Fig-

ure 7-3 on page 24).

With a low signal at CSN, the ATA6842 will be selected for communication by the microproces-

sor. With clock pulses at CLK, the address and data transfer will be synchronized. DI is the input

for address and data from the microprocessor to ATA6842. The data must be valid at the falling

edge of the CLK pin. DO transfers data from ATA6842 to the microprocessor.

Table 7-7.

Control Register 1xxxxx01 Sent by Microprocessor

Bit

Name

Meaning

Function

Comment

7TWLN

Trigger warning

lamp

0: WLN = off

1: WLN = on

See Table 7-4 on page 21

and Table 7-9 on page 25

6

TOUTN

Trigger OUTN

0: OUTN = off

1: OUTN = on

See Table 7-10 and Table

7-11 on page 26

5

TOUTP

Trigger OUTP

0: OUTP = off

1: OUTP = on

See Table 7-10 and Table

7-11 on page 26

4TEN

Trigger enable

(keep alive)

0: no keep alive

1: keep alive

See Table 7-1 on page 18

3TV12S

Trigger V12

switch

0: V12S = off

1: V12S = V12

Used in Testmode 3

see Table 7-9 on page 25

2TUVR

Trigger

undervoltage

reference

0: if UVM < 3

× UVR => UVW = low

0: if UVM > 3

× UVR => UVW = high

1: UVW = low

1

–

–

–

No function

0OTDE

Overtemperature

detection enable

0: temperature detection off

1: temperature detection on

Set OTS = high

if overtemperature =>

OTS = high, else low

Note:

Bold: default state after reset by RSTN = low

Table 7-8.

Control Register 1xxxxx10 Sent by Microprocessor

Bit

Name

Meaning

Function

Comment

7

TTCFET

Trigger test

current FET

0: TCFET = off

1: TCFET = on

See Table 7-9 on page 25

6

TRESAN

Trigger RESAN

0: default

1: RESAN = reset (low)

5

–

–

–

No function

4TRD4

Trigger relay

driver 4

0: RD4 = off

1: RD4 = on if RD3 = off

See Table 7-2 on page 19,

Table 7-3 on page 19 and

Table 7-9 on page 25

3TRD3

Trigger relay

driver 3

0: RD3 = off

1: RD3 = on if RD4 = off

2TRD2

Trigger relay

driver 2

0: RD2 = off

1: RD2 = on if RD1 = off

1TRD1

Trigger relay

driver 1

0: RD1 = off

1: RD1 = on if RD2 = off

0

–

–

–

No function

Note:

Bold: default state after reset by RSTN = low