1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones

Datasheet

SMSC EMC1043

21

Revision 1.37 (09-05-06)

DATASHEET

4.5

Configuration 2 Register - (04h)

The Configuration 2 Register controls the basic functionality of the EMC1043 that is NOT compatible

with the EMC1023.

Bit 3 - MAX_RES - controls the external diode conversion time during dynamic averaging. Although

the dynamic averaging may be used to increase the ADC resolution, only 11 bits of data are available

in the temperature registers.

‘0’ - the dynamic averaging will set the ADC averaging factor at 1x when the conversion rate is set

at 16 conversions per second and 2x at conversion rates lower than 16 per second.

‘1’ (default) - the dynamic averaging will set the ADC averaging factor at 1x when the conversion

rate is set at 16 conversions per second, 2x at 8 conversions / second and 4x at conversion rates

lower than 8 per second.

Bit 2 - DA_n - controls the dynamic digital averaging circuitry. See Section 3.3.2.

‘0’ (default) - dynamic averaging is enabled. Depending on the selected conversion rate, the ADC

averaging factor is increased for the external diodes.

‘1’ - dynamic averaging is disabled. The ADC averaging factor will remain fixed at 1x for all

conversion rates and will allow increased power savings at the slower conversion rates.

Bit 1 - COMP - configures the device to perform a comparison for the Hotter of Two mode (see Section

3.3, "Operation During Run Mode," on page 12.)

‘0’ (default) - the device is in normal mode

‘1’ - the device is in Hotter of Two mode. In this mode, the two external diode channels are

measured and compared against each other. The hotter of the two channels has its data loaded

into the External Diode 2 Data Registers. The Internal Diode and External Diode 1 Data Registers

remain unaffected.

Bit 0 - REC - controls the Resistance Error Correction circuitry

'0' - - The Resistance Error Correction circuitry is disabled.

'1' (default) - The Resistance Error Correction circuitry is active and will automatically correct for

up to 100 ohms of series resistance in the diode lines for both External Diode 1 and External Diode

2 channels.

4.6

One Shot Register - (0Fh)

The One Shot Register is an address place holder for the one-shot command. Writing to the address

initiates the command. The data written is not important and is not stored. Reading from the one-shot

registers will always return 00h.

Table 4.5 Configuration 2 Register

ADDR

REGISTER

B7B6B5B4

B3

B2

B1

B0

DEFAULT

04h

CFG2

-

-

-

-

MAX_RES

DA_n

COMP

REC

09h

Table 4.6 One Shot Registers

ADDR

REGISTER

B7

B6

B5

B4

B3

B2

B1

B0

DEFAULT

0Fh

One Shot

Conversion

Writing to this register address initiates the one-shot. The data is not

important and is not stored

00h