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EMC2302 Fiches technique(PDF) 13 Page - Microchip Technology

No de pièce EMC2302
Description  Single/Multiple RPM-Based PWM Fan Controller
PDF  70 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

EMC2302 Fiches technique(HTML) 13 Page - Microchip Technology

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 2021 Microchip Technology Inc.
DS20006532A-page 13
EMC2301/2/3/5
4.0
PRODUCT DESCRIPTION
The EMC2301/2/3/5 family is an SMBus compliant fan
controller with up to five programmable frequency
PWM fan drivers. The fan drivers can be operated
using two modes: the RPM-based Fan Speed Control
algorithm or the direct fan drive setting. Figure 4-1
shows a system diagram of the EMC2301/2/3/5 family.
FIGURE 4-1:
EMC2301/2/3/5 Family System Diagram.
4.1
Fan Control Modes of Operation
The EMC2301/2/3/5 has two modes of operation for
each fan driver. Each mode of operation uses the
Ramp Rate control and Spin Up Routine.
1.
Direct Setting mode - in this mode of operation,
the user directly controls the fan drive setting.
Updating the Fan Driver Setting Register (see
Register 6-11) will instantly update the PWM fan
drive. Ramp rate control is optional and enabled
via the ENRCx bits (see Register 6-14).
Whenever the Direct Setting mode is enabled,
the current drive will be changed to what was
last written into the Fan Driver Setting Register.
The conversion from register value to percent
drive in shown in Equation 4-1.
EQUATION 4-1:
REGISTER VALUE TO
DRIVE
2.
Fan Speed Control (FSC) mode - in this mode of
operation, the user determines a target tachom-
eter count and the PWM drive setting is auto-
matically updated to achieve this target speed.
The algorithm uses the Spin Up Routine and has
user-definable ramp rate controls.
This mode is enabled setting the ENAGx bit in
the
Fan
Configuration
Register
(see
Register 6-13).
EMC230x
SMCLK
SMDATA
ALERT#
VDD
3.3V
MCU
ADDR_SEL
GND
32.768 Hz Clock
Input or Output
CLK
TACH5
tachometer
PWM5
Drive
Circuit
TACH2
tachometer
PWM2
Drive
Circuit
TACH1
tachometer
PWM1
Drive
Circuit
Drive
VALUE
255
------------------

 100%
=



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