NCP81243_17 datasheet(18/26 Pages) ONSEMI | Dual Output 3 & 2 Phase Controller

Part No.	NCP81243

Description	Dual Output 3 & 2 Phase Controller

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NCP81243

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18

VBOOT and Intel proprietary interface Address Programming

The NCP81243 has a VBOOT voltage register that can be

externally programmed for both core and Auxiliary boot−up

output voltages. The VBOOT voltage for main and auxiliary

rails can be programmed with a resistor from VBOOT and

VBOOTA pin to GND. In addition to VBOOT level, pin 28

and pin 29 also support Intel proprietary interface bus

address programming. The NCP81243 support multiple

Intel proprietary interface Device Addresses per rail. Pin 28

(VBOOT/ADDR) is used to set the address for the main rail,

pin 29 (VBOOTA/ADDRA) is used to address the Auxiliary

rail. On power up a 10

mA current is sourced from these pins

through a resistor connected to this pin and the resulting

voltage is measured. Table 7 shows the resistor values that

should be used and the corresponding Intel proprietary

interface and VBOOT options for each rail.

Pin 28 (VBOOT/ADDR) Resistor

LEVEL

VBOOT

Address

Auto Phase Shedding Disabling

10000

1

0

No

15000

2

0

Yes

21000

3

1.2

0

no

26700

4

0.9

0

No

33200

5

0

1

No

41200

6

0

1

Yes

49900

7

1.2

1

No

60400

8

0.9

1

No

71500

9

0

2

No

84500

10

0

2

Yes

97600

11

1.2

2

No

115000

12

1.5

2

No

133000

13

0

4

No

154000

14

0

4

Yes

178000

15

1.2

4

No

210000

16

1.5

4

No

Table 7. VBOOT, ADDRESS PROGRAMMABILITY MAIN AND AUX RAILS

Pin 27 (VBOOTA/ADDRA) Resistor

LEVEL

VBOOT AUX

Address AUX

10000

1

0

1

13000

2

1.05

1

15800

3

1.2

1

20000

4

0.9

1

23700

5

0

28000

6

1.05

0

33200

7

1.2

0

38300

8

0.9

0

45000

9

0

2

52300

10

1.05

2

60400

11

1.2

2

69800

12

1.5

2

80600

13

0

3

93100

14

1.05

3

107000

15

1.2

3

121000

16

1.5

3

137000

17

0.8

2

158000

18

0.95

2

180000

19

0.8

3

210000

20

0.95

3

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