EMC1002_06 Datasheet, PDF (15/22 Pages) SMSC Corporation – 1°C Dual SMBus Sensor with Resistance Error Correction

1°C Dual SMBus Sensor with Resistance Error Correction
Datasheet
Table 4.5 Configuration Register (continued)
CONFIGURATION REGISTER
BIT
4–3
2
1-0
NAME
Reserved
Temperature Range
Select
Reserved
0 = 0°C to 127°C
1 = -64°C to 191°C
FUNCTION
DEFAULT
0
0
0
Bit 7 is used to mask the ALERT/THERM2 output. When this bit is set to 0, any out of limit condition
will assert ALERT/THERM2. This bit is ignored if the ALERT/THERM2 pin is configured as THERM2 signal
by bit 5.
Bit 6 initiates ADC conversions. When this bit is low, the ADC will convert temperatures in a
continuous mode. When this bit is high, the ADC will be in standby mode, thus reducing supply
current significantly though the SMBus will still be active. If bit 6 is 1 and the one-shot register is
written to, the ADC will execute a temperature measurement and then return to standby mode.
Bit 5 sets the ALERT/THERM2 pin to act as either an SMBALERT# signal or as the THERM2 signal. If
bit 5 is set to 1 the ALERT/THERM2 pin acts as the THERM2 signal and bit 7 is ignored.
Bit 2 selects the range and format of the temperature as shown in Table 4.1, “Temperature Data
Format,” on page 11
4.11
Conversion Rate Register
The conversion rate register determines how many times the temperature value will be updated per
second. The lowest 4 bits configure a programmable delay that waits between consecutive conversion
cycles to obtain the desired conversion rate. Table 4.6 shows the conversion rate and the associated
quiescent current.
VALUE
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh to FFh
Table 4.6 Conversion Rates
CONVERSION RATE
CONVERSIONS/SECOND
0.0625
0.125
0.25
0.5
1
2
4
8
16
32
64
Reserved
TYPICAL QUIESCENT CURRENT (μA)
47
50
53
56
68
78
106
165
281
500
550
4.12 Limit Registers
The EMC1002 compares the limit registers to the measured temperature. The data format of the
programmed limits for this comparison is the same as the measurement data format determined by
SMSC EMC1002
15
DATASHEET
Revision 1.3 (03-24-06)