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TMP411 Datasheet(PDF) 19 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Part # TMP411
Description  짹1째C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

TMP411 Datasheet(HTML) 19 Page - Burr-Brown (TI)

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TMP411
SBOS383A − FEBRUARY 2007
www.ti.com
19
HIGH-SPEED MODE
In order for the Two-Wire bus to operate at frequencies
above 400kHz, the master device must issue a
High-speed mode (Hs-mode) master code (00001XXX) as
the first byte after a START condition to switch the bus to
high-speed operation. The TMP411 will not acknowledge
this byte, but will switch the input filters on SDA and SCL
and the output filter on SDA to operate in Hs-mode,
allowing transfers at up to 3.4MHz. After the Hs-mode
master code has been issued, the master transmits a
Two-Wire slave address to initiate a data transfer
operation. The bus continues to operate in Hs-mode until
a STOP condition occurs on the bus. Upon receiving the
STOP condition, the TMP411 switches the input and
output filter back to fast-mode operation.
TIMEOUT FUNCTION
When bit 7 of the Consecutive Alert Register is set high,
the TMP411 timeout function is enabled. The TMP411
resets the serial interface if either SCL or SDA are held low
for 30ms (typical) between a START and STOP condition.
If the TMP411 is holding the bus low, it releases the bus
and waits for a START condition. To avoid activating the
timeout
function,
it
is
necessary
to
maintain
a
communication speed of at least 1kHz for the SCL
operating frequency. The default state of the timeout
function is enabled (bit 7 = high).
THERM (PIN 4) AND ALERT/THERM2 (PIN 6)
The TMP411 has two pins dedicated to alarm functions,
the THERM and ALERT/THERM2 pins. Both pins are
open-drain outputs that each require a pull-up resistor to
V+. These pins can be wire-ORed together with other
alarm pins for system monitoring of multiple sensors. The
THERM pin provides a thermal interrupt that cannot be
software disabled. The ALERT pin is intended for use as
an earlier warning interrupt, and can be software disabled,
or masked. The ALERT/THERM2 pin can also be
configured for use as THERM2, a second THERM pin
(Configuration Register: AL/TH bit = 1). The default setting
configures pin 6 to function as ALERT (AL/TH = 0).
The THERM pin asserts low when either the measured
local or remote temperature is outside of the temperature
range programmed in the corresponding Local/Remote
THERM Limit Register. The THERM temperature limit
range can be programmed with a wider range than that of
the limit registers, which allows ALERT to provide an
earlier warning than THERM. The THERM alarm resets
automatically when the measured temperature returns to
within the THERM temperature limit range minus the
hysteresis value stored in the THERM Hysteresis
Register. The allowable values of hysteresis are shown in
Table 10. The default hysteresis is 10
°C. When the
ALERT/THERM2 pin is configured as a second thermal
alarm (Configuration Register: bit 7 = 0, bit 5 = 1), it
functions the same as THERM, but uses the temperatures
stored in the Local/Remote Temperature High/Low Limit
Registers to set its comparison range.
When ALERT/THERM2 (pin 6) is configured as ALERT
(Configuration Register: bit 7 = 0, bit 5 = 0), the pin asserts
low when either the measured local or remote temperature
violates the range limit set by the corresponding
Local/Remote Temperature High/Low Limit Registers.
This alert function can be configured to assert only if the
range is violated a specified number of consecutive times
(1, 2, 3, or 4). The consecutive violation limit is set in the
Consecutive Alert Register. False alerts that occur as a
result of environmental noise can be prevented by
requiring consecutive faults. ALERT also asserts low if the
remote temperature sensor is open-circuit. When the
MASK function is enabled (Configuration Register:
bit 7 = 1), ALERT is disabled (that is, masked). ALERT
resets when the master reads the device address, as long
as the condition that caused the alert no longer persists,
and the Status Register has been reset.
Measured
Temperature
THERM Limit and ALERT High Limit
ALERT Low Limit and THERM Limit Hysteresis
THERM
ALERT
SMBus ALERT
Read
Read
Time
Read
Figure 17. SMBus Alert Timing Diagram


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