參數(shù)資料
型號(hào)： SE95
廠商： NXP Semiconductors N.V.
元件分類： 溫度/濕度傳感器
英文描述： Ultra high accuracy digital temperature sensor and thermal WatchdogE
中文描述： 超高精度數(shù)字溫度傳感器和熱WatchdogE
文件頁(yè)數(shù)： 10/20頁(yè)
文件大小： 198K
代理商： SE95
Philips Semiconductors
Product data sheet
SE95
Ultra high accuracy digital temperature sensor and
thermal Watchdog
2004 Dec 21
10
I
2
C serial interface
The SE95 can be connected to a compatible 2-wire serial interface
I
2
C-bus as a slave device under the control of a controller or master
device, using two device terminals, SCL and SDA. The controller
must provide the SCL clock signal and write/read data to/from the
device through the SDA terminal. Note that if the I
2
C common
pull-up resistors have not been installed as required for I
2
C-bus,
then an external pull-up resistor, about 10 k
, is needed for each of
these two terminals. The bus communication protocols are
described in the data communication section.
Slave address
The SE95 slave address on the I
2
C-bus is partially defined by the
logic applied to the device address pins A2, A1 and A0. Each pin is
typically connected either to GND for logic 0, or to V
CC
for logic 1.
These pins represent the three LSB bits of the device 7-bit address.
The other four MSB bits of the address data are preset to ‘1001’ by
hard wiring inside the SE95. Table 1 shows the device’s complete
address and indicates that up to 8 devices can be connected to the
same bus without address conflict. Because the input pins, SCL,
SDA, A2–A0, are not internally biased, it is important that they
should not be left floating in any application.
Table 1. Address table
1 = HIGH, 0 = LOW
MSB
LSB
1
0
0
1
A2
A1
A0
Register list
The SE95 contains 7 data registers. The registers can be 1 byte or
2 bytes wide, and are defined in Table 2. The registers are accessed
by the value in the content of the pointer register during I
2
C-bus
communication. The types of registers are: read only, read/write,
and reserved for manufacturer use. Note that when reading a
two-byte register, the host must provide enough clock pulses as
required by the I
2
C protocol (see the “Data communication” section)
for the device to completely return both data bytes. Otherwise the
device may hold the SDA line as LOW state, resulting in a bus hang
condition.
Register pointer
The register pointer or pointer byte is an 8-bit data byte that is
equivalent to the register command in the I
2
C-bus definitions and is
used to identify the device register to be accessed for a write or read
operation. Its values are listed as pointer values in Table 2, “Register
table”. For the device register I
2
C-bus communication, the pointer
byte may or may not need to be included within the command as
illustrated in the I
2
C protocol figures in section “Data
communication” on page 14.
The command statements of writing data to a register must always
include the pointer byte; while the command statements of reading
data from a register may or may not include it. To read a register that
is different from the one that has been recently read, the pointer byte
must be included. However, to re-read a register that has been
recently read, the pointer byte may not have to be included in the
reading.
At power-up, the pointer value is preset to ‘0’ for the Temp Register;
users can then read the temperature without specifying the pointer
byte.
Table 2. Register table
Register name
Pointer value
R/W
POR state
Description
Conf
01H
R/W
00H
Configuration Register.
Contains a single 8-bit data byte. To set an operating condition.
Temp
00H
Read only
N/A
Temperature Register.
Contains two 8-bit data bytes. To store the measured Temp data.
Tos
03H
R/W
50 00H
Over-temp Shutdown threshold Register.
Contains two 8-bit data bytes. To store the over-temp shut-down Tos limit.
Default = 80
°
C.
Thyst
02H
R/W
4B 00H
Hysteresis Register.
Contains two 8-bit data bytes. To store the hysteresis Thyst limit.
B7–B0 are also used in OTP test mode to supply OTP write data.
Default = 75
°
C.
ID
05H
Read only
A1H
ID Register.
Contains a single 8-bit data byte for the manufacturer ID code.
reserved
04H
N/A
N/A
Reserved.
reserved
06H
N/A
N/A
Reserved.
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