SE95 datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > The sensor> SE95

Preview

SE95: DescriptionUltra high accuracy digital temperature sensor and thermal WatchdogE; CategoryThe sensor; File Size126KB，27 Pages; ManufacturerNXP; Websitehttps://www.nxp.com

Download Datasheet View All

SE95 Overview

Ultra high accuracy digital temperature sensor and thermal WatchdogE

Preview

Download Datasheet

View All

SE95

Ultra high accuracy digital temperature sensor and thermal

watchdog

Rev. 07 — 2 September 2009

Product data sheet

1. General description

The SE95 is a temperature-to-digital converter using an on-chip band gap temperature

sensor and Sigma Delta analog-to-digital conversion technique. The device is also a

thermal detector providing an overtemperature detection output.

The SE95 contains a number of data registers accessed by a controller via the 2-wire

serial I

C-bus interface:

•

Conﬁguration register (Conf) to store the device settings such as sampling rate,

device operation mode, OS operation mode, OS polarity, and OS fault queue

•

Temperature register (Temp) to store the digital Temp reading

•

Set-point registers (Tos and Thyst) to store programmable overtemperature shutdown

and hysteresis limits

•

Identiﬁcation register (ID) to store manufacturer numbers

The device includes an open-drain output (pin OS) which becomes active when the

temperature exceeds the programmed limits. There are three selectable logic address

pins (pins A2 to A0) so that eight devices can be connected on the same bus without

address conﬂict.

The SE95 can be conﬁgured for different operation conditions. It can be set in normal

mode to periodically monitor the ambient temperature, or in shutdown mode to minimize

power consumption. The OS output operates in either of two selectable modes: OS

comparator mode and OS interrupt mode. Its active state can be selected as either HIGH

or LOW. The fault queue that deﬁnes the number of consecutive faults in order to activate

the OS output is programmable as well as the set-point limits.

The temperature register always stores a 13-bit two’s complement data giving a

temperature resolution of 0.03125

°C.

This high temperature resolution is particularly

useful in applications of measuring precisely the thermal drift or runaway. For normal

operation and compatibility with the LM75A, only the 11 MSBs are read, with a resolution

of 0.125

°C

to provide the accuracies speciﬁed. To be compatible with the LM75, read only

the 9 MSBs.

The device is powered-up in normal operation mode with the OS in comparator mode,

temperature threshold of 80

°C

and hysteresis of 75

°C,

so that it can be used as a

stand-alone thermostat with those pre-deﬁned temperature set points. The conversion

rate is programmable, with a default of 10 conversions/s.

NXP Semiconductors

SE95

Ultra high accuracy digital temperature sensor and thermal watchdog

Pin description

…continued

Description

user-deﬁned address bit 1 digital input

user-deﬁned address bit 0 digital input

supply voltage

Table 2.

Symbol

7. Functional description

7.1 General operation

The SE95 uses the on-chip band gap sensor to measure the device temperature with a

resolution of 0.03125

°C

and stores the 13-bit two’s complement digital data, resulting

from 13-bit analog to digital conversion, into register Temp. Register Temp can be read at

any time by a controller on the I

C-bus. Reading temperature data does not affect the

conversion in progress during the read operation.

The device can be set to operate in either mode: normal or shutdown mode. In normal

operation mode, by default, the temperature-to-digital conversion is executed every

100 ms and register Temp is updated at the end of each conversion. In shutdown mode,

the device becomes idle, data conversion is disabled and register Temp holds the latest

result; however, the device I

C-bus interface is still active and register write/read operation

can be performed. The device operation mode is controlled by programming bit

SHUTDOWN of register Conf. The temperature conversion is initiated when the device is

powered up or returned to normal mode from shutdown mode.

In addition, at the end of each conversion in normal mode, the temperature data (or Temp)

in register Temp is automatically compared with the overtemperature shutdown threshold

data (or Tos) stored in register Tos, and the hysteresis data (or Thyst) stored in register

Thyst, in order to set the state of the device OS output accordingly. The registers Tos and

Thyst are write/read capable, and both operate with 9-bit two’s complement digital data.

To match with this 9-bit operation, register Temp uses only the 9 MSB bits of its 13-bit data

for the comparison.

The device temperature conversion rate is programmable and can be chosen to be one of

the four values: 0.125, 1.0, 10, and 30 conversions/s. The default conversion rate is

10 conversions/s. Furthermore, the conversion rate is selected by programming bits

RATEVAL[1:0] of register Conf as shown in

Table 6.

Note that the average supply current

as well as the device power consumption increase with the conversion rate.

The way that the OS output responds to the comparison operation depends upon the OS

operation mode selected by conﬁguration bit OS_COMP_INT, and the user-deﬁned fault

queue deﬁned by conﬁguration bits OS_F_QUE[1:0].

In OS comparator mode, the OS output behaves like a thermostat. It becomes active

when the temperature exceeds T

, and is reset when the temperature drops below T

hyst

Reading the device registers or putting the device into shutdown mode does not change

the state of the OS output. The OS output in this case can be used to control cooling fans

or thermal switches.

SE95_7

Product data sheet

Rev. 07 — 2 September 2009

4 of 27

Recommended Resources

Digital display electronic clock circuit

555 linear voltage/frequency converter circuit (4)

Power oscillator using component FX0021

High power tube single-ended class A 211 amplifier

820e computer motherboard circuit diagram_62

Voice control core circuit

Experts, please come and see, AD603 problem: My AD603 gets very hot when I use it. I don't know why. The circuit is correct....; xupeilinhong Analog electronics

How to make a DIY old motherboard wall clock: I went to a friend's house on the weekend and found this strange DIY clock in his study. I thought it was so cool. Let me show it to you. It's quite unique, and the color combination is also good. In ...; crazyk Creative Market

Please give me a code for operating nrf24l01 with msp430 hardware spi. The code I wrote always fails to send.: The code is transplanted from Zhengdian Atom, but the previous SPI configuration part is written by myself. Can anyone help me find out where the configuration is wrong? I have tried both hardware SPI...; jianping-sun Microcontroller MCU

Please teach me the process of CE driver development~~: I have only been in contact with CE for a month. I have been doing application development before. I found that the CE file directory is complicated and I have no idea for a while. I hope experts can ...; icdragon Embedded System

Display QR code-Intelligent TFT module: Application Example : Using TOPWAY Smart LCD (HMT050CC-C) to display QR code Step 1: Create a project①Open the Editor software and click on the menu bar to create a new project File -- New Project ②En...; 慈俭不敢为人先 Industrial Control Electronics

Happy New Year everyone, welcome to join Google Android's QQ group: 54011153: Happy New Year everyone, welcome to join Google Android's QQ group: 54011153. Welcome to: http://www.loveandroid.com Thank you....; qzm Embedded System

Shortcut: L0 L1 L2 L3 L4 L5 L6 L7 L8 L9 LA LB LC LD LE LF LG LH LI LJ LK LL LM LN LO LP LQ LR LS LT LU LV LW LX LY LZ M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 MA MB MC MD ME MF MG MH MI MJ MK ML MM MN MO MP MQ MR MS MT MU MV MW MX MY MZ N0 N1 N2 N3 N4 N5 N6 N7 N8 NA NB NC ND NE NF NG NH NI NJ NK NL NM NN NO NP NQ NR NS NT NU NV NX NZ O0 O1 O2 O3 OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OP OQ OR OS OT OV OX OY OZ P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 PA PB PC PD PE PF PG PH PI PJ PK PL PM PN PO PP PQ PR PS PT PU PV PW PX PY PZ Q1 Q2 Q3 Q4 Q5 Q6 Q8 Q9 QA QB QC QE QF QG QH QK QL QM QP QR QS QT QV QW QX QY R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 RA RB RC RD RE RF RG RH RI RJ RK RL RM RN RO RP RQ RR RS RT RU RV RW RX RY RZ

Popular Components