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PDF EMCT03-ACZB Data sheet ( Hoja de datos )
| Número de pieza | EMCT03-ACZB | |
| Descripción | 1C TRIPLE SMBUS TEMPERATURE SENSOR | |
| Fabricantes | ETC | |
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EMCT03
1°C Triple SMBus
Temperature Sensor
Datasheet
www.DataSheet4U.com
General Description
The EMCT03 is a System Management Bus (SMBus)
temperature sensor that is capable of monitoring three
temperature zones. The three temperature zones
consist of two external and one internal temperature
diode. The internal 11 bit sigma-delta ADC architecture
with digital filtering attributes to superb linearity and
immunity to interference and noise. An extended
temperature format may be selected for compatibility
with a broad range of CPUs. Selectable conversion
rates and standby mode support low-power operation.
Features
■ Low Power; 3.0V to 3.6V Supply
— Programmable conversion rate
— < 1mA at 16 Conversions per Second
— < 3uA in Standby Mode
■ SMBus 2.0 Compliant interface
■ Two External Temperature Monitors:
— Range -64°C to +191°C
— 0.125°C resolution
— ±1°C Accuracy 40°C to 80°C
— Diode Fault Reporting
■ Internal Temperature Monitor
— Range 0°C to +85°C
— 0.125°C resolution
— ±3°C Accuracy 0°C to 85°C
■ Programmable Conversion Rate
■ MSOP-8 3x3mm Package; Green, Lead-Free
Package also available.
Simplified Block Diagram
DP1
DN1
Switching
Current
DP2
DN2
Local Temp
Diode
EMCT03
11-bit
Sigma Delta
ADC
Remote Temp
Register 1
Remote Temp
Register 2
Local Temp
Register
Configuration
Register
Digital Mux
and
Byte Interlock
Status Register
SMCLK
SMDATA
SMSC EMCT03
DATASHEET
Revision 2.3 (04-19-05)
1 page  
1°C Triple SMBus Temperature Sensor
Datasheet
SMCLK
TLOW
TR
THIGH
TF
THD:STA
TSU:STO
SMDATA
THD:STA
THD:DAT TSU:DAT
TSU:STA
TBUF
P S S - Start Condition
S P - Stop Condition P
Figure 2.1 System Management Bus Timing Diagram
VDD=3.3V±10%, Temp=0°C to 85°C, unless otherwise noted.
CHARACTERISTIC
System Management Bus Timing
Operating Frequency, FSMB
Spike Suppression
Bus free time Start to Stop, TBUF
Hold time Start THD:STA
Setup time Start TSU:STA
Setup time Stop TSU:STO
Data hold time THD:DAT
Data setup time TSU:DAT
Clock Low period TLOW
Clock High Period THIGH
Clock/Data Fall Time, TF
Clock/Data Rise Time, TR
System Management Bus SMCLK, SMDATA
Input High Current
Input Low Current
Input Capacitance
Low Input Level
High Input Level
Hysteresis
Low Output Level @ 4mA
MIN
10
1.3
0.6
0.6
0.6
0.3
100
1.3
0.6
2.0
TYP
MAX
UNIT
400 kHz
50 ns
µs
µs
µs
µs
0.9 µs
ns
µs
µs
300 ns
300 ns
10 µA
-10 µA
10 pF
0.8 V
V
500 mV
0.4 V
SMSC EMCT03
5
DATASHEET
Revision 2.3 (04-19-05)
5 Page 
1°C Triple SMBus Temperature Sensor
Datasheet
Table 3.8 Extended Temperature Data Format (continued)
ACTUAL TEMP.
(°C)
-64°C OFFSET
(°C)
2’S COMPLEMENT
OF -64°C OFFSET
HEX
+65
+191
= +191.875
1
127
127.875
0000 0001 0000 0000
0111 1111 0000 0000
0111 1111 1110 0000
0100
7F00
7FE0
Table 3.7 and Table 3.8 show that temperature data is stored in 2’s complement in both Legacy and
Extended Temperature Data Format. Both extended and legacy temperature formats are updated
simultaneously after every conversion cycle. Code 8000h is reserved for diode fault signaling which
occurs when open or short conditions are present between the external DP and DN pins.
3.7 Status Register
Table 3.9 Status Register
REGISTER
Status
BIT 7
Busy
BIT 6
-
BIT 5
-
BIT 4
-
BIT 3
-
BIT 2
-
BIT 1
D2
BIT 0
D1
DEF
00h
The Status register is a read only register and returns the operational status of the part. It indicates an
external diode fault conditions through bit 0 and 1. When either D1 or D2 is set, a faulty diode
connection is detected for external diode 1 or external diode 2 respectively. Also, when diode faults
are detected, temperature readings for the faulty external diode will return 8000h. The EMCT03 detects
both open and short conditions for the DP1/2 and DN1/2 pins. Bit 7 of the status register will be set
when the internal ADC is busy converting data.
3.8 Configuration Register
Table 3.10 Configuration Register
REGISTER
Configuration
BIT 7
-
BIT 6
nRun/Stop
BIT 5
-
BIT 4
-
BIT 3
-
BIT 2
CR2
BIT 1
CR1
BIT 0
CR0
DEF
47h
Bits 0 through bit 2 of the configuration register set the ADC conversion rate of the part:
Table 3.11 Configuration Register, Conversion Rate
CR2, CR1, CR0
000
001
010
011
100
101
110
111
CONVERSION RATE
Reserved
Reserved
Reserved
1 Conversions per second
2 Conversions per second
4 Conversions per second
8 Conversions per second
16 Conversions per second
SMSC EMCT03
11
DATASHEET
Revision 2.3 (04-19-05)
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet EMCT03-ACZB.PDF ] | |
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