EMC1182 datasheet(34/48 Pages) MICROCHIP

34 / 48 page

Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications

Datasheet

Revision 1.0 (07-11-13)

SMSC EMC1182

DATASHEET

If the temperature drops below the Therm Limit or Hardware Thermal Shutdown Limit, the counter is

reset. If the programmed number of consecutive measurements exceed the Therm Limit or Hardware

Thermal Shutdown Limit, and the appropriate channel is linked to the SYS_SHDN pin, the SYS_SHDN

pin will be asserted low.

Once the SYS_SHDN pin is asserted, the consecutive Therm counter will not reset until the

corresponding temperature drops below the appropriate limit minus the corresponding hysteresis.

Bits 6-4 - CTHRM[2:0] - Determines the number of consecutive measurements that must exceed the

corresponding Therm Limit before the THERM pin is asserted. All temperature channels use this value

to set the respective counters. The consecutive Therm counter is incremented whenever any

measurement exceed the corresponding Therm Limit.

If the temperature drops below the Therm Limit, the counter is reset. If a number of consecutive

measurements above the Therm Limit occurs, the THERM pin is asserted low.

Once the THERM pin has been asserted, the consecutive therm counter will not reset until the

corresponding temperature drops below the Therm Limit minus the Therm Hysteresis value.

The bits are decoded as shown in Table 6.12. The default setting is 4 consecutive out of limit

conversions.

Bits 3-1 - CALRT[2:0] - Determine the number of consecutive measurements that must have an out of

limit condition or diode fault before the ALERT / THERM2 pin is asserted. Both temperature channels

use this value to set the respective counters. The bits are decoded as shown in Table 6.12. The default

setting is 1 consecutive out of limit conversion.

6.12

Beta Configuration Register 25h

This register is used to set the Beta Compensation factor that is used for the external diode channel.



‘0’ - The Beta Compensation Factor auto-detection circuitry is disabled.

‘1’ (default) - The Beta Compensation factor auto-detection circuitry is enabled. At the beginning of

every conversion, the optimal Beta Compensation factor setting will be determined and applied.

Table 6.12 Consecutive Alert / Therm Settings

NUMBER OF CONSECUTIVE OUT OF LIMIT

MEASUREMENTS

(default for CALRT[2:0])

(default for CTHRM[2:0])

Table 6.13 Beta Configuration Register

ADDR.

R/W

DEFAULT

25h

R/W

External

Diode Beta

Configuration

ENABLE

BETA[2:0]

08h

EMC1182 bảng dữ liệu(PDF) 34 Page - Microchip Technology

EMC1182 bảng dữ liệu(HTML) 34 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

bảng dữ liệu tải về

Link URL