欢迎访问ic37.com |
会员登录 免费注册
发布采购

MLX90614ESF-DBB 参数 Datasheet PDF下载

MLX90614ESF-DBB图片预览
型号: MLX90614ESF-DBB
PDF下载: 下载PDF文件 查看货源
内容描述: 单个和双重红外温度计TO- 39 [Single and Dual Zone Infra Red Thermometer in TO-39]
分类和应用:
文件页数/大小: 40 页 / 837 K
品牌: MELEXIS [ Melexis Microelectronic Systems ]
 浏览型号MLX90614ESF-DBB的Datasheet PDF文件第9页浏览型号MLX90614ESF-DBB的Datasheet PDF文件第10页浏览型号MLX90614ESF-DBB的Datasheet PDF文件第11页浏览型号MLX90614ESF-DBB的Datasheet PDF文件第12页浏览型号MLX90614ESF-DBB的Datasheet PDF文件第14页浏览型号MLX90614ESF-DBB的Datasheet PDF文件第15页浏览型号MLX90614ESF-DBB的Datasheet PDF文件第16页浏览型号MLX90614ESF-DBB的Datasheet PDF文件第17页  
MLX90614 family  
Single and Dual Zone  
Infra Red Thermometer in TO-39  
8.3.4 RAM  
It is not possible to write into the RAM memory. It can only be read and only a limited number of RAM  
registers are of interest to the customer.  
RAM (32x17)  
Name  
Address  
000h  
Read access  
Melexis reserved  
Yes  
Melexis reserved  
TA  
TOBJ1  
TOBJ2  
Melexis reserved  
005h  
006h  
007h  
008h  
009h  
Yes  
Yes  
Yes  
Yes  
Yes  
Melexis reserved  
01Fh  
Yes  
8.4 SMBus compatible 2-wire protocol  
The chip supports a 2 wires serial protocol, build with pins PWM/SDA and SCL.  
SCL – digital input, used as the clock for SMBus compatible communication. This pin has the  
auxiliary function for building an external voltage regulator. When the external voltage regulator is  
used, the 2-wire protocol is available only if the power supply regulator is overdriven.  
PWM/SDA – Digital input/output, used for both the PWM output of the measured object  
temperature(s) or the digital input/output for the SMBus. The pin can be programmed in EEPROM to  
operate as Push/Pull or open drain NMOS (open drain NMOS is factory default). In SMBus mode  
SDA is forced to open drain NMOS I/O, push-pull selection bit defines PWM/Thermal relay operation.  
8.4.1 Functional description  
The SMBus interface is a 2-wire protocol, allowing communication between the Master Device (MD) and one  
or more Slave Devices (SD). In the system only one master can be presented at any given time [1]. The  
MLX90614 can only be used as a slave device.  
Generally, the MD initiates the start of data transfer by selecting a SD through the Slave Address (SA).  
The MD has read access to the RAM and EEPROM and write access to 9 EEPROM cells (at addresses  
0x20h, 0x21h, 0x22h, 0x23h, 0x24h, 0x25h*, 0x2Eh, 0x2Fh, 0x39h). If the access to the MLX90614 is a read  
operation it will respond with 16 data bits and 8 bit PEC only if its own slave address, programmed in internal  
EEPROM, is equal to the SA, sent by the master. The SA feature allows connecting up to 127 devices with  
only 2 wires, unless the system has some of the specific features described in paragraph 5.2 of reference  
[1]. In order to provide access to any device or to assign an address to a SD before it is connected to the bus  
system, the communication must start with zero SA followed by low RWB bit. When this command is sent  
from the MD, the MLX90614 will always respond and will ignore the internal chip code information.  
Special care must be taken not to put two MLX90614 devices with the same SD addresses on the  
same bus as MLX90614 does not support ARP[1].  
The MD can force the MLX90614 into low consumption mode “sleep mode” (3V version only).  
Read flags like “EEBUSY” (1 – EEPROM is busy with executing the previous write/erase), “EE_DEAD” (1 –  
there is fatal EEPROM error and this chip is not functional**).  
Note*: This address is readable and writable. Bit 3 should not be altered as this will cancel the factory  
calibration.  
Note**: EEPROM error signaling is implemented in automotive grade parts only.  
3901090614  
Rev 003  
Page 13 of 40  
Data Sheet  
03/Oct/2007