MAX6649MUA+T Maxim Integrated Products, MAX6649MUA+T Datasheet - Page 11

• Manufacturer Part Number: MAX6649MUA+T
• Description: IC SENSOR REMOTE SMBUS 8UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX6649MUA+T

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -55°C ~ 125°C, External Sensor
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Full Temp Accuracy: +/- 3 C, +/- 3.2 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 11 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 7. Status Register Bit Assignments (02h)
The MAX6646/MAX6647/MAX6649 have fixed slave
addresses (see Table 9). All devices also respond to the
SMBus alert response slave address (see the Alert
Response Address section).
To prevent ambiguous power-supply conditions from
corrupting the data in memory and causing erratic
behavior, a POR voltage detector monitors V
clears the memory if V
power is first applied and V
the logic blocks begin operating, although reads and
writes at V
second V
prevents the ADC from converting until there is sufficient
headroom (V
Power-up defaults include:
• Interrupt latch is cleared.
• ADC begins autoconverting at a 4Hz rate.
• Command byte is set to 00h to facilitate quick local
• Local (internal) T
• Local (internal) T
• Remote (external) T
• OVERT (internal) limit is set to +85°C
• OVERT (external) limit is set to +85°C (MAX6649)/
7 (MSB)
temperature receive byte queries.
(MAX6649)/+95°C (MAX6646/MAX6647)
+125°C (MAX6646/MAX6647)
BIT
6
5
4
3
2
1
0
CC
CC
+145°C Precision SMBus-Compatible Remote/
RHIGH
LHIGH
FAULT
NAME
RLOW
LLOW
BUSY
EOT
IOT
Local Sensors with Overtemperature Alarms
CC
comparator, the ADC UVLO comparator,
levels below 3V are not recommended. A
= 2.7V typ).
______________________________________________________________________________________
HIGH
LOW
STATE
POR
CC
0
0
0
0
0
0
0
0
limit is set to 0°C.
limit is set to +85°C.
HIGH
falls below 2.0V (typ). When
CC
Power-Up Defaults
A/D is busy converting when 1.
Local (internal) high-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer exists.
Local (internal) low-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer exists.
Remote (external) high-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer exists.
Remote (external) low-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer exists.
A 1 indicates DXN and DXP are either shorted or open; cleared by POR or readout of the status
byte if the fault condition no longer exists.
A 1 indicates the remote (external) junction temperature exceeds the external OVERT threshold.
A 1 indicates the local (internal) junction temperature exceeds the internal OVERT threshold.
rises above 2.0V (typ),
limit is set to +85°C
Slave Addresses
POR and UVLO
CC
and
Table 9. Slave Addresses
Table 8. Conversion-Rate Control Byte
(04h)
08h-FFh
FUNCTION
DATA
00h
01h
02h
03h
04h
05h
06h
07h
MAX6646
MAX6647
MAX6649
PART
CONVERSION
SLAVE ADDRESS
RATE (Hz)
Reserved
0.0625
0.125
0.25
0.5
1001 101
1001 110
1001 100
1
2
4
4
11