CFA633-RDI-KS datasheet(33/88 Pages) CRYSTAIFONTZ

33 / 88 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1)

February 2012

Page 33

setting to 0% or 100% there should be no compatibility issues. We do not recommend operating a fan below 20% PWM

duty cycle for an extended period of time. Limiting the minimum PWM duty cycle to 30% or 40% should reduce the

mechanical and electrical stresses in the fan, avoiding premature failure.

When power is applied to the CFA633-RDI-KS, it will set each fan's power to the default value of 100% or to the value

that is stored in the boot state. To minimize peak current loading on the +12v supply during start-up, the fans are started

in sequence with a 0.5 second delay between any fans that are on.

CONNECT OPTIONAL CRYSTALFONTZ WR-DOW-Y17 TEMPERATURE

SENSORS

The Crystalfontz WR-DOW-Y17 cable has a DS18B20 Dallas Programmable Resolution One-Wire (DOW) temperature

sensor attached to a “daisy chainable” cable. (“Daisy chain” means several devices connected in a linear series.)

Connect one WR-DOW-Y17 to the connector labeled J_DOW.

Figure 15. J_DOW Connection for WR-DOW-Y17 Temperature Sensor

If desired, connect the WR-DOW-Y17’s 3-pin male connector to an additional WR-DOW-Y17 temperature sensor. Up to

32 WR-DOW-Y17 temperature sensors can be connected. (“Daisy chained”.)

The DS18B20 on the WR-DOW-Y17 has 0.5°C absolute accuracy. Or you make a temperature sensor cable using a

DS1822 Dallas Econo One-Wire Digital Thermometer with +2°C accuracy.

Any temperature sensor can be configured to be automatically read and display to the CFA633-RDI-KS's LCD in °C or

°F (see command 21 (0x15): Set Up Live Fan or Temperature Display (Pg. 49)). Independently, any temperature sensor

can be configured to report to the host (see 19 (0x13): Set Up Temperature Reporting (Pg. 48)). Any sensors configured

to be reported are updated once each second.

c 2010

America, Inc.

Crystalfontz

J_DOW

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