DS9101 datasheet(48/55 Pages) MAXIM

48 / 55 page

Hygrochron Temperature/Humidity Logger

iButton with 8KB Data-Log Memory

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Step 2: Write the setup data to register page 1.

During the setup, the device needs to learn the follow-

ing information:

• Time and Date

• Sample Rate

• Alarm Thresholds

• Alarm Controls (Response to Conditional Search ROM)

• General Mission Parameters (e.g., Channels to Log

and Logging Format, Rollover, Start Mode)

• Mission Start Delay

The following data sets up the DS1923 for a mission

that logs temperature and humidity using 8-bit format

for both.

ADDRESS

DATA

EXAMPLE VALUES

FUNCTION

0200h

00h

0201h

30h

0202h

15h

15:30:00 hours

Time

0203h

15h

0204h

05h

0205h

04h

15th of May in 2004

Date

0206h

0Ah

0207h

00h

Every 10 minutes (EHSS = 0)

Sample rate

0208h

66h

0209h

7Ah

10°C Low

20°C High

Temperature Alarm Thresholds

020Ah

6Fh

020Bh

9Eh

40%RH Low

70%RH High

Humidity Alarm Threshold, no software

correction used

020Ch

FFh

020Dh

FFh

020Eh

FFh

020Fh

FFh

(Don’t care)

Clock through read-only registers

0210h

03h

Enable high and low alarm

Temperature Alarm Control

0211h

FFh

Enable high and low alarm

Humidity Alarm Control

0212h

01h

On (enabled), EHSS = 0 (low sample rate)

RTC Oscillator Control, sample rate selection

0213h

C3h

Normal start; no rollover; 8-bit logging

General Mission Control

0214h

FFh

0215h

FFh

(Don’t care)

Clock through read-only registers

0216h

5Ah

0217h

00h

0218h

00h

90 minutes

Mission Start Delay

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