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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： | 5/31頁 |
| 文件大小： | 477K |
| 代理商： | TMP435ADGST |
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SBOS495A – MARCH 2010 – REVISED APRIL 2010
Pointer Register
Limit Registers
Figure 14 shows the internal register structure of the
The TMP435 has registers for setting comparator
TMP435. The 8-bit Pointer Register is used to
limits for both the local and remote measurement
address a given data register. The Pointer Register
channels. These registers have read and write
identifies which of the data registers should respond
capability. The High and Low Limit Registers for both
to a read or write command on the two-wire bus. This
channels span two registers, as do the temperature
register is set with every write command. A write
registers. The local temperature high limit is set by
command must be issued to set the proper value in
writing the high byte to pointer address 0Bh and
the
Pointer
Register
before
executing
a
read
writing the low byte to pointer address 16h, or by
command. Table 3 describes the pointer address of
using a single two-byte write command (high byte
the registers available in the TMP435. The power-on
first) to pointer address 0Bh.
reset (POR) value of the Pointer Register is 00h
The local temperature high limit is obtained by
(0000 0000b).
reading the high byte from pointer address 05h and
the low byte from pointer address 16h, or by using a
Temperature Registers
two-byte read command from pointer address 05h.
The power-on reset value of the local temperature
The TMP435 has four 8-bit registers that hold
high limit is 55h/00h (+85°C in standard temperature
temperature measurement results. Both the local
mode; +21°C in extended temperature mode).
channel and the remote channel have a high byte
register that contains the most significant bits (MSBs)
Similarly, the local temperature low limit is set by
of the temperature analog-to-digital converter (ADC)
writing the high byte to pointer address 0Ch and
result and a low byte register that contains the least
writing the low byte to pointer address 17h, or by
significant bits (LSBs) of the temperature ADC result.
using a single two-byte write command to pointer
The local channel high byte address for the TMP435
address 0Ch. The local temperature low limit is read
is 00h; the local channel low byte address is 15h. The
by reading the high byte from pointer address 06h
remote channel high byte is at address 01h; the
and the low byte from pointer address 17h, or by
remote channel low byte address is 10h. These
using a two-byte read from pointer address 06h. The
registers are read-only and are updated by the ADC
power-on reset value of the local temperature low
each time a temperature measurement is completed.
limit register is 00h/00h (0°C in standard temperature
mode; –64°C in extended mode).
The TMP435 contains circuitry to assure that a low
byte register read command returns data from the
The remote temperature high limit for the TMP435 is
same
analog-to-digital
(A/D)
conversion
as
the
set by writing the high byte to pointer address 0Dh
immediately preceding high byte read command. This
and writing the low byte to pointer address 13h, or by
assurance remains valid only until another register is
using a two-byte write command to pointer address
read. For proper operation, the high byte of a
0Dh. The remote temperature high limit is obtained
temperature register should be read first. The low
by reading the high byte from pointer address 07h
byte register should be read in the next read
and the low byte from pointer address 13h, or by
command. The low byte register may be left unread if
using a two-byte read command from pointer address
the
LSBs
are
not
needed.
Alternatively,
the
07h. The power-on reset value of the Remote
temperature registers may be read as a 16-bit
Temperature High Limit Register is 55h/00h (+85°C in
register by using a single two-byte read command
standard temperature mode; +21°C in extended
from address 00h for the local channel result, or from
temperature mode).
address 01h for the remote channel result (23h for
the second remote channel result). The high byte is
The remote temperature low limit for the TMP435 is
output first, followed by the low byte. Both bytes of
set by writing the high byte to pointer address 0Eh
this
read
operation
are
from
the
same
A/D
and writing the low byte to pointer address 14h, or by
conversion.
The
power-on
reset
value
of
both
using a two-byte write to pointer address 0Eh. The
temperature registers is 00h.
remote temperature low limit is read by reading the
high byte from pointer address 08h and the low byte
from pointer address 14h, or by using a two-byte read
from pointer address 08h. The power-on reset value
of the Remote Temperature Low Limit Register is
00h/00h (0°C in standard temperature mode; –64°C
in extended mode).
Copyright 2010, Texas Instruments Incorporated
13
Product Folder Link(s): TMP435
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