LM93 datasheet(40/92 Pages) NSC

40 / 92 page

16.0 Registers (Continued)

16.3 FACTORY REGISTERS 00h–3Fh

16.3.1 Register 00h

XOR Test

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

00h

R/W

XOR Test

RES

XEN

00h

Bit

Name

R/W

Default

Description

Sleep

Masking

XEN

R/W

The LM93 incorporates an XOR tree test mode. When the test mode is enabled

by setting this bit, the part enters XOR test mode. Clearing this bit brings the part

out of XOR test mode.

N/A

7:1

RES

Reserved

N/A

The reserved bits of this register should only be used by the manufacturer for testing of the ASIC.

16.3.2 Register 01h

SMBus Test

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

01h

R/W

SMBus Test

76543210N/D

This register can be used to verify that the SMBus can read and write to the device without effecting any programmed settings.

16.3.3 Register 3Eh

Manufacturer ID

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

3Eh

Manufactur ID

00000000

01h

The Manufacturer ID register contains the manufacturer identification number. This number is assigned by National Semicon-

ductor and is a method for uniquely identifying the part manufacturer.

16.3.4 Register 3Fh

Version/Stepping

Address

Read/

Write

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

Value

3Fh

Version/Stepping

VER[3:0]

STP[3:0]

73h

01110011

The four least significant bits of the Version/Stepping register [3:0] contain the current stepping of the LM93 silicon. The four most

significant bits [7:4] reflect the LM93 version number. The LM93 has a fixed version number of 0111b. For the first stepping of

LM93, this register reads 01110000b. For the second stepping of the LM93, this register reads 01110001b and so on. It is

incrementaly increased for future versions for the silicon. The final released silicon has a stepping of 3h therefore this register

reads 73h.

The register is used by application software to identify which device in the family of hardware monitoring ASICs has been

implemented in the given system. Based on this information, software can determine which registers to read from and write to.

Application software may use the current stepping to implement work-a-rounds for bugs found in a specific silicon stepping.

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