EMC2101-R-ACZL-TR SMSC, EMC2101-R-ACZL-TR Datasheet - Page 20

• Manufacturer Part Number: EMC2101-R-ACZL-TR
• Description: Board Mount Temperature Sensors Single Fan Controller
• Manufacturer: SMSC

Specifications of EMC2101-R-ACZL-TR

• Full Temp Accuracy: +/- 2 C , +/- 3 C
• Package / Case: MSOP
• Output Type: Analog
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Revision 2.54 (06-16-09)
5.1
5.2
5.3
Thermal
diode
GPU
The EMC2101-R has two modes of operation based on the pull-up resistor on the ALERT pin (see
Table
1. Host Configuration Mode - An SMBus Host configures the EMC2101-R upon startup to allow for
2. Automatic Configuration Mode - The EMC2101-R queries an SMBus compatible EEPROM located
The EMC2101-R (only) will power up with the fan driver set to either 100% duty cycle or 0% duty cycle,
depending on the value of the pull-up resistor on the ALERT / TACH pin. (See
in this state until either the Fan Setting Register is written or until the following activities have occurred:
1. The Fan Control Look-Up Table is loaded and the PROG bit is set to ‘0’
2. The temperature monitoring block performs its first comparison against the Look-Up Table.
If the Fan Control Look-Up Table is used, the EMC2101-R Fan Driver will be immediately set to the
appropriate setting in the table based on the measured temperature.
The EMC2101 supports multiple power modes that are user configurable. The temperature monitoring
and fan control functions of the device are independent. The power modes are:
1. Normal - the temperature monitoring and fan driver circuits are both active. The device updates all
2. Standby - the temperature monitoring and fan driver circuits are both disabled. The device will not
Modes of Operation (EMC2101-R Only)
Power Up (EMC2101-R Only)
Power Modes
polling for temperature or fan information or the user can use the ALERT pin interrupt to determine
which action is required.
at a known address (see
EEPROM. This mode does not require host intervention but a host can poll the device for
temperature and fan information.
temperature channels at the user programmed conversion rate (see
temperature is updated, the limits are checked and the fan driver is updated based on the values
in the Fan Control Look-Up Table (if the Fan Control Look-Up Table is enabled).
update temperature data automatically and the fan output will be set to default drive. A one-shot
5.1). The modes of operation are:
Figure 5.2 System Diagram for EMC2101-R
EMC2101-R
DP
DN
EEPROM
SMBus
Loader
Internal
Client
Diode
Section
DATASHEET
4.9) and automatically loads its registers with the contents of the
ALERT
SMCLK
SMDATA
20
FAN
SMBus Fan Control with 1°C Accurate Temperature Monitoring
Fan Drive
Circuitry
EEPROM
or Host
Table
Table
6.6). Every time the
5.1.) It will remain
SMSC EMC2101
Datasheet