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MAX7500 Evaluation Kit
Setting the I 2 C Slave Address (A2, A1, A0)
The MAX7500 has eight available slave addresses that
can be selected by setting the A2, A1, and A0 pins
either high or low. The EV kit provides jumpers JU2,
JU3, and JU4 to set A2, A1, and A0, respectively. JU2
also provides an additional option useful for evaluating
the MAX7501–MAX7504 that will be discussed in a later
section. The default configuration of the EV kit sets A2,
A1, and A0 low, resulting in a slave address of 0x90.
User-Supplied I 2 C/SMBus Interface
To use the MAX7500 EV kit with a user-supplied
I 2 C/SMBus interface, first move the shunts of JU6 and
JU8 to the 1-2 position. Then, connect the SDA and SCL
signals to the corresponding SDA and SCL pads on the
MAX7500 EV kit board. R6 and R7 footprints are provid-
ed for the option to add pullup resistors if needed.
Evaluating the MAX7501–MAX7504
The MAX7500 EV kit can also be configured to accept
the MAX7501–MAX7504. To evaluate the MAX7501–
MAX7504, replace the IC (U1) and set JU2 to pins 1-3
( RESET input).
To utilize the RESET input on the MAX7501–MAX7504,
JU14 must also be set accordingly: Pins 1-2 for an
external RESET input or pins 2-3 for software control of
the RESET input. Note: To apply an external RESET
signal, apply a low pulse with a duration of at least 1μs
at the RESET pad. Refer to the MAX7501–MAX7504 IC
data sheet for additional information.
Detailed Description of Software
The MAX7500 EV kit software accurately reads temper-
ature data with a 0.5 ° C resolution, sets the upper and
lower temperature threshold limits, and configures the
behavior of the open-drain overtemperature shutdown
(OS) output. The MAX7500 supports eight different I 2 C
slave addresses; configure JU2, JU3, and JU4 to select
between different addresses. Check the Shutdown
checkbox (Figure 1) to shut down the MAX7500 internal
blocks. By pressing the Defaults button, the device is
restored to its power-on-reset (POR) state. Refer to the
MAX7500–MAX7504 IC data sheet for further details.
Reading Temperature
Temperature data is displayed on the software main
window (Figure 1). To read temperature, press the
Read button and the sensor temperature is displayed
on the software interface with a 0.5 ° C resolution. The
Auto-Read checkbox is provided to continuously read
and display the temperature and limit registers’ data
when checked.
The OS Fault indicator is displayed under the tempera-
ture data on the software’s main GUI. The indicator
asserts (turns red) when the OS is asserted. The indica-
tor deasserts (turns green) when the OS is deasserted.
Refer to the T OS and T HYST Registers section in the
MAX7500–MAX7504 IC data sheet for more information.
Setting T OS and T HYST Registers
The T OS and T HYST registers can be set by writing the
appropriate values in the TOS and THYST edit boxes
and pressing their respective Write button. The current
contents of the T OS and T HYST registers can be read
by pressing on the Read button.
Configuration Register
The Configuration group box sets the fault queue, OS
polarity, shutdown control, and whether the OS output
functions in comparator or interrupt mode. The Fault
Queue drop-down list determines the number of faults
necessary to trigger an OS condition. The OS Polarity
drop-down list forces the OS polarity to either active-
low or active-high. The Shutdown checkbox, when
checked, shuts down the internal blocks and drops the
supply current to 3μA.
The Mode drop-down list selects between running the
OS output in comparator or interrupt modes. In com-
parator mode, OS is asserted when the temperature
rises above the T OS value and is deasserted when the
temperature drops below the T HYST value. In interrupt
mode, OS is asserted when the temperature rises
above the T OS value or falls below the T HYST value
and OS is deasserted only after performing a read
operation.
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相关代理商/技术参数
MAX7500MSA
功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
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