參數(shù)資料
型號(hào)： MAX6649YMUA+T
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： +145°C Precision SMBus-Compatible Remote/Local Sensors with Overtemperature Alarms
中文描述： SPECIALTY ANALOG CIRCUIT, DSO8
封裝： ROHS COMPLIANT, MO-187C-AA, MICRO MAX PACKAGE-8
文件頁(yè)數(shù)： 3/22頁(yè)
文件大?。?/td> 670K
代理商： MAX6649YMUA+T
MAX6646/MAX6647/MAX6649
+145°C Precision SMBus-Compatible Remote/
Local Sensors with Overtemperature Alarms
______________________________________________________________________________________
11
Slave Addresses
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).
POR and UVLO
To prevent ambiguous power-supply conditions from
corrupting the data in memory and causing erratic
behavior, a POR voltage detector monitors VCC and
clears the memory if VCC falls below 2.0V (typ). When
power is first applied and VCC rises above 2.0V (typ),
the logic blocks begin operating, although reads and
writes at VCC levels below 3V are not recommended. A
second VCC comparator, the ADC UVLO comparator,
prevents the ADC from converting until there is sufficient
headroom (VCC = 2.7V typ).
Power-Up Defaults
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
temperature receive byte queries.
Local (internal) THIGH limit is set to +85°C.
Local (internal) TLOW limit is set to 0°C.
Remote (external) THIGH limit is set to +85°C
(MAX6649)/+95°C (MAX6646/MAX6647)
OVERT (internal) limit is set to +85°C
OVERT (external) limit is set to +85°C (MAX6649)/
+125°C (MAX6646/MAX6647)
DATA
CONVERSION
RATE (Hz)
00h
0.0625
01h
0.125
02h
0.25
03h
0.5
04h
1
05h
2
06h
4
07h
4
08h-FFh
Reserved
Table 8. Conversion-Rate Control Byte
(04h)
BIT
NAME
POR
STATE
FUNCTION
7 (MSB)
BUSY
0
A/D is busy converting when 1.
6
LHIGH
0
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.
5
LLOW
0
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.
4
RHIGH
0
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.
3
RLOW
0
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.
2
FAULT
0
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.
1
EOT
0
A 1 indicates the remote (external) junction temperature exceeds the external
OVERT threshold.
0
IOT
0
A 1 indicates the local (internal) junction temperature exceeds the internal
OVERT threshold.
Table 7. Status Register Bit Assignments (02h)
PART
SLAVE ADDRESS
MAX6646
1001 101
MAX6647
1001 110
MAX6649
1001 100
Table 9. Slave Addresses
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