DS620 Digital Thermometer and Thermostat

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Figure 5. Configuration Register

Address ACh

bit 15

bit 14

bit 13

bit 12

bit 11

bit 10

bit 9

bit 8

MS Byte

DONE

NVB

THF

TLF

R1

*

R0

*

AUTOC

*

1SHOT

*

Address ADh

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

LS Byte

PO2

A2

A1

A0

M*

M*

M*

Table 5. Configuration Register Bit Descriptions

Bit Name

User Access

Functional Description

DONE

Read Only

At power-up, DONE = 1. (Unless AUTOC = 1)

DONE = 0—Temperature conversion is in progress.

DONE = 1—Temperature conversion is complete.

NVB

Read Only

At power-up, NVB = 0

NVB = 1—Write to an E

NVB = 0—Nonvolatile memory is not busy.

THF

Read/Write

At power-up, THF = 0

THF = 1—The measured temperature has reached or exceeded the value

cleared. THF remains a 1 until the power is cycled or it is overwritten with a

0 by the user.

TLF

Read/Write

At power-up, TLF = 0

TLF = 1—The measured temperature has met or fallen below the value

cleared. TLF remains a 1 until the power is cycled or it is overwritten with a

0 by the user.

R1

*

Read/Write

Used to set conversion resolution (see Table 6).

Factory state = 1

R0

*

Read/Write

Used to set conversion resolution (see Table 6).

Factory state = 1

AUTOC

*

Read/Write

Determines whether the DS620 powers up idle or converting.

Factory state = 0

AUTOC = 1—DS620 powers-up converting temperature.

AUTOC = 0—DS620 powers-up idle.

1SHOT

*

Read/Write

Configures temperature conversion mode. Factory state = 0

1SHOT = 1: One-shot mode

§

For AUTOC = 0, the device powers up idle The Start Convert

command causes a single temperature conversion and then the

device returns to a low-power standby state.

§

If AUTOC = 1, the A1 pin is reconfigured as a conversion trigger for

standalone operation and the device powers up and performs 1

conversion. Single conversions can be initiated using the Start

Convert command or by toggling A1 high.

1SHOT = 0: Continuous conversion mode

§

For AUTOC = 0, the Start Convert command initiates continuous

conversions.

§

For AUTOC = 1, the device powers up performing continuous

conversions. Note: Changing the 1SHOT bit to 1 while continuous

conversions are in progress does not stop the conversions. A Stop

Convert command must first be issued after which one-shot