MAX6647 Ver la hoja de datos (PDF) - Maxim Integrated
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Fabricante
MAX6647
Maxim Integrated
MAX6647 Datasheet PDF : 16 Pages
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+145°C Precision SMBus-Compatible Remote/
Local Sensors with Overtemperature Alarms
Table 7. Status Register Bit Assignments (02h)
BIT NAME
7 (MSB) BUSY
6
LHIGH
5
LLOW
4
RHIGH
3
RLOW
2
FAULT
1
EOT
0
IOT
POR
STATE
0
0
0
0
0
0
0
0
FUNCTION
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.
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 include:
Power-Up Defaults
• 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)
Table 8. Conversion-Rate Control Byte
(04h)
DATA
00h
01h
02h
03h
04h
05h
06h
07h
08h-FFh
CONVERSION
RATE (Hz)
0.0625
0.125
0.25
0.5
1
2
4
4
Reserved
Table 9. Slave Addresses
PART
MAX6646
MAX6647
MAX6649
SLAVE ADDRESS
1001 101
1001 110
1001 100
11
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