參數(shù)資料
型號： TMP435ADGST
廠商： TEXAS INSTRUMENTS INC
元件分類： 模擬信號調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁數(shù)： 7/31頁
文件大?。?/td> 477K
代理商： TMP435ADGST
www.ti.com
SBOS495A – MARCH 2010 – REVISED APRIL 2010
The LHIGH and RHIGH bit values depend on the
Configuration Register 1
state of the AL/TH bit in the Configuration Register. If
Configuration Register 1 sets the temperature range,
the AL/TH bit is ‘0’, the LHIGH bit reads as ‘1’ if the
controls shutdown mode, and determines how the
local high limit was exceeded since the last clearing
ALERT/THERM2 pin functions. This Configuration
of the Status Register. The RHIGH bit reads as ‘1’ if
Register is set by writing to pointer address 09h and
the remote high limit was exceeded since the last
read by reading from pointer address 03h.
clearing of the Status Register. If the AL/TH bit is ‘1’,
the remote high limit and the local high limit are used
The MASK bit (bit 7) enables or disables the ALERT
to implement a THERM2 function. LHIGH reads as ‘1’
pin output if ALERT/THERM2 = 0. If ALERT/THERM2
if the local temperature has exceeded the local high
= 1 then the MASK bit has no effect. If MASK is set to
limit and remains greater than the local high limit less
‘0’, the ALERT pin goes low when one of the
the value in the Hysteresis Register.
temperature measurement channels exceeds its high
or low limits for the chosen number of consecutive
The RHIGH bit reads as ‘1’ if the remote temperature
conversions. If the MASK bit is set to ‘1’, the TMP435
has exceeded the remote high limit and remains
retains the ALERT pin status, but the ALERT pin
greater than the remote high limit less the value in
does not go low.
the Hysteresis Register.
The shutdown (SD) bit (bit 6) enables or disables the
The LLOW and RLOW bits are not affected by the
temperature measurement circuitry. lf SD = 0, the
AL/TH bit. The LLOW bit reads as ‘1’ if the local low
TMP435 converts continuously at the rate set in the
limit was exceeded since the last clearing of the
conversion rate register. When SD is set to '1', the
Status Register. The RLOW bit reads as ‘1’ if the
TMP435 immediately stops converting and enters a
remote low limit was exceeded since the last clearing
shutdown mode. When SD is set to '0' again, the
of the Status Register.
TMP435 resumes continuous conversions. A single
The values of the LLOW, RLOW, and OPEN (as well
conversion can be started when SD = 1 by writing to
as LHIGH and RHIGH when AL/TH is ‘0’) are latched
the One-Shot Register.
and read as ‘1’ until the Status Register is read or a
The AL/TH bit (bit 5) controls whether the ALERT pin
device reset occurs. These bits are cleared by
functions in ALERT mode or THERM2 mode. If ALTH
reading the Status Register, provided that the
= 0, the ALERT pin operates as an interrupt pin. In
condition causing the flag to be set no longer exists.
this mode, the ALERT pin goes low after the set
The values of BUSY, LTHRM, and RTHRM (as well
number
of
consecutive
out-of-limit
temperature
as LHIGH and RHIGH when ALERT/THERM2 is ‘1’)
measurements occur.
are not latched and are not cleared by reading the
Status Register. They always indicate the current
If AL/TH = 1, the ALERT/THERM2 pin implements a
state, and are updated appropriately at the end of the
THERM function (THERM2). In this mode, THERM2
corresponding A/D conversion. Clearing the Status
functions similar to the THERM pin except that the
Register bits does not clear the state of the ALERT
local high limit and remote high limit registers are
pin; an SMBus alert response address command
used for the thresholds. THERM2 goes low when
must be used to clear the ALERT pin.
either RHIGH or LHIGH is set.
The TMP435 NORs, LHIGH, LLOW, RHIGH, RLOW,
The temperature range is set by configuring bit 2 of
and OPEN, so a status change for any of these flags
Configuration
Register
1.
Setting
this
bit
low
from ‘0’ to ‘1’ automatically causes the ALERT pin to
configures
the
TMP435
for
the
standard
go low (only applies when the ALERT/THERM2 pin is
measurement range (0°C to +127°C); temperature
configured for ALERT mode).
conversions are stored in the standard binary format.
Setting bit 2 high configures the TMP435 for the
space
extended measurement range (–55°C to +150°C);
space
temperature conversions are stored in the extended
binary format (see Table 1).
space
The remaining bits of Configuration Register 1 are
space
reserved and must always be set to ‘0’. The power-on
reset
value
for
this
register
is
00h.
space
summarizes the bits of Configuration Register 1.
Copyright 2010, Texas Instruments Incorporated
15
Product Folder Link(s): TMP435
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