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| 型号： | TMP435ADGST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 18/31页 |
| 文件大小： | 477K |
| 代理商： | TMP435ADGST |
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Measured
Temperature
THERMLimitandALERTHighLimit
ALERTLowLimitandTHERMLimitHysteresis
THERM
ALERT
SMBusALERT
Read
Time
Read
www.ti.com
SBOS495A – MARCH 2010 – REVISED APRIL 2010
Figure 20. SMBus Alert Timing Diagram
space
Under-Voltage Lockout
If multiple devices on the bus respond to the SMBus
Alert command, arbitration during the slave address
The TMP435 senses when the power-supply voltage
portion of the SMBus Alert command determines
has reached a minimum voltage level for the ADC to
which device must clear its alert status. If the
function. The detection circuitry consists of a voltage
TMP435 wins the arbitration, its ALERT pin becomes
comparator that enables the ADC after the power
inactive at the completion of the SMBus Alert
supply (V+) exceeds 2.45V (typical). The comparator
command. If the TMP435 loses the arbitration, the
output is continuously checked during a conversion.
ALERT pin remains active.
The TMP435 does not perform a temperature
conversion if the power supply is not valid. The last
Shutdown Mode (SD)
valid
measured
temperature
is
used
for
the
temperature measurement result.
The TMP435 shutdown mode allows the user to save
maximum power by shutting down all device circuitry
General Call Reset
other than the serial interface, reducing current
consumption to typically less than 3A; see the
The TMP435 supports reset via the Two-Wire
typical characteristic graph, Shutdown Quiescent
General
Call
address
00h
(0000
0000b).
The
Current vs Supply Voltage (Figure 6). Shutdown
TMP435 acknowledges the General Call address and
mode is enabled when the SD bit of the Configuration
responds to the second byte. If the second byte is
Register
1
is
high;
the
device
shuts
down
06h (0000 0110b), the TMP435 executes a software
immediately, aborting the current conversion. When
reset. This software reset restores the power-on reset
SD is low, the device maintains a continuous
state to all TMP435 registers, aborts any conversion
conversion state.
in progress, and clears the ALERT and THERM pins.
The TMP435 takes no action in response to other
Sensor Fault
values in the second byte.
The TMP435 can sense a fault at the DXP input that
Filtering
results from incorrect diode connection or an open
circuit. The detection circuitry consists of a voltage
Remote junction temperature sensors are usually
comparator that trips when the voltage at DXP
implemented in a noisy environment. Noise is
exceeds (V+) – 0.6V (typical). The comparator output
frequently generated by fast digital signals and if not
is continuously checked during a conversion. If a fault
filtered properly will induce errors that can corrupt
is detected, the last valid measured temperature is
temperature measurements. The TMP435 has a
used for the temperature measurement result, the
built-in 65kHz filter on the inputs of DXP and DXN to
OPEN bit (Status Register, bit 2) is set high, and, if
minimize the effects of noise. However, a differential
the alert function is enabled, ALERT asserts low.
low-pass filter can help attenuate unwanted coupled
signals.
Exact
component
values
are
When not using the remote sensor with the TMP435,
application-specific. It is also recommended that the
the DXP and DXN inputs must be connected together
capacitor value remains between 0pF to 2200pF with
to prevent meaningless fault warnings.
a series resistance less than 1k
.
Copyright 2010, Texas Instruments Incorporated
25
Product Folder Link(s): TMP435
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