Conversion Rate And One-Shot Registers

ADDRESS

Hex

Read/

Write

Bits

POR

Value

Name

Description

04 (0A)

04 (0A)

R/W

7:0

0x08

Conversion

Rate

Sets the conversion rate of the LM64.

00000000 = 0.0625 Hz

00000001 = 0.125 Hz

00000010 = 0.25 Hz

00000011 = 0.5 Hz

00000100 = 1 Hz

00000101 = 2 Hz

00000110 = 4 Hz

00000111 = 8 Hz

00001000 = 16 Hz

00001001 = 32 Hz

All other values = 32 Hz

04 (0A)

0F

Write

Only

7:0

N/A

One Shot

Trigger

With the LM64 in the STANDBY mode a single write to this register will

initiate one complete temperature conversion cycle.

ID Registers

ADDRESS

Hex

Read/

Write

Bits

POR

Value

Name

Description

FF

FF

Read

Only

7:0

0x51

Stepping/Die

Revision ID

Version of LM64

FE

FE

Read

Only

7:0

0x01

Manufacturer’s ID

0x01 = National Semiconductor

General Purpose Registers

ADDRESS

Hex

Read/

Write

Bits

POR

Value

Name

Description

1A

1A

Read

Only

7:5

000

These bits are unused and always set to 0.

4:0

(Note 17)

General

Purpose

Input

These 5 bits reflect the logic states of the GPIOx pins.

1B

1B

R/W

7:5

000

These bits are unused and always set to 0.

4:0

(Note 18)

General

Purpose

Output

These 5 bits reflect the GPI register bits [4:0] except for

Power-On-Default when they are the 5 logic states of the

General Pupose Default (GPD) input pins.

Note 17: For Register 0x1A the Power-On-Reset for the five LSB’s are the logic states present on the 5 GPIOx pins.

Note 18: For Register 0x1B the Power-On-Reset for the five LSB’s are the logic states present on the 5 GPDx pins.

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