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參數資料
| 型號： | TMP435ADGST |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | GREEN, PLASTIC, MSOP-10 |
| 文件頁數： | 6/31頁 |
| 文件大小： | 477K |
| 代理商： | TMP435ADGST |
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SBOS495A – MARCH 2010 – REVISED APRIL 2010
www.ti.com
The TMP435 also has a THERM limit register for both
Status Register
the local and the remote channels. These are 8-bit
The TMP435 has a Status Register to report the state
registers and allow for THERM limits set to 1°C
of the temperature comparators. Table 4 shows the
resolution. The local channel THERM limit is set by
Status Register bits. The Status Register is read-only
writing to pointer address 20h. The remote channel
and is read by reading from pointer address 02h.
THERM limit is set by writing to pointer address 19h.
The BUSY bit reads as ‘1’ if the ADC is making a
The local channel THERM limit is obtained by reading
conversion. It reads as ‘0’ if the ADC is not
from pointer address 20h; the remote channel
converting.
THERM limit is read by reading from pointer address
19h. The power-on reset value of the THERM limit
The OPEN bit reads as ‘1’ if the remote transistor
registers is 55h (+85°C in standard temperature
was detected as open since the last read of the
mode; +21°C in extended temperature mode). The
Status Register. The OPEN status is only detected
THERM limit comparators also have hysteresis. The
when the ADC attempts to convert a remote
hysteresis of both comparators is set by writing to
temperature.
pointer address 21h. The hysteresis value is obtained
The
RTHRM
bit
reads
as
‘1’
if
the
remote
by reading from pointer address 21h. The value in the
temperature has exceeded the remote THERM limit
Hysteresis Register is an unsigned number (always
and remains greater than the remote THERM limit
positive). The power-on reset value of this register is
less the value in the shared Hysteresis Register; see
0Ah (+10°C).
Whenever changing between standard and extended
The LTHRM bit reads as ‘1’ if the local temperature
temperature ranges, be aware that the temperatures
has exceeded the local THERM limit and remains
stored in the temperature limit registers are NOT
greater than the local THERM limit less the value in
automatically reformatted to correspond to the new
the shared Hysteresis Register; see Figure 20.
temperature range format. These values must be
reprogrammed in the appropriate binary or extended
binary format.
Table 4. TMP435 Status Register Format
TMP435 STATUS REGISTER (Read = 02h, Write = NA)
BIT #
D7
D6
D5
D4
D3
D2
D1
D0
BIT NAME
BUSY
LHIGH
LLOW
RHIGH
RLOW
OPEN
RTHRM
LTHRM
POR VALUE
0(1)
0
(1)
The BUSY bit changes to ‘1’ almost immediately (<< 100ms) following power-up, as the TMP435 begins the first temperature conversion.
It is high whenever the TMP435 is converting a temperature reading.
14
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TMP435
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