DS1821SSLASHTR datasheet(8/18 Pages) DALLAS

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DS1821

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CONFIGURATION REGISTER BIT DESCRIPTIONS Table 3

Bit Name

(User Access)

Functional Description

DONE — Temperature Conversion Done

(Read Only)

DONE = 0 — Temperature conversion is in progress.

DONE = 1 — Temperature conversion is complete.

NOTE: DONE = 0 at POR.

NVB — Non-volatile Memory Busy

(Read Only)

NVB = 0 — Nonvolatile memory is not busy.

NVB = 1 — A write to EEPROM memory is in progress

THF* — Temperature High Flag

(Read/Write)

THF = 0 — The measured temperature has not exceeded the

value stored in the TH register.

THF = 1 — At some point in time the measured temperature has

been higher than the value stored in the TH register. THF will

remain a 1 until it is over-written with a 0 by the user.

TLF* — Temperature Low Flag

(Read/Write)

TLF = 0 — The measured temperature has not been lower than

the value stored in the TL register.

TLF = 1 — At some point in time the measured temperature has

been lower than the value stored in the TL register. TLF will

remain a 1 until it is over-written with a 0 by the user.

T/R

¯* — Power-up Operating Mode

(Read/Write)

T/R

¯ = 0 — DS1821 powers up in 1- wire mode.

T/R

¯ = 1 — DS1821 powers up in thermostat mode.

POL* — Thermostat Output (DQ) Polarity

(Read/Write)

POL = 0 — Thermostat output (DQ) is active low.

POL = 1 — Thermostat output (DQ) is active high.

1SHOT* — Conversion Mode

(Read/Write)

1SHOT = 0 — Continuous conversion mode. The Start Convert

T [EEh] command initiates continuous temperature conversions,

which can be stopped with the Stop Convert T [22h] command.

1SHOT = 1 — One-shot mode. The Start Convert T [EEh]

command initiates a single temperature conversion after which

the DS1821 returns to a low-power standby state.

*Stored in EEPROM

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