Signal conditioning circuitry is also included to accommodate the slow rise and fall times. Based on a count of 153, nominal speeds are programmable from 1100 to 8800 RPM. The full-scale fan counts are 255 (8-bit counter), representing a stopped or slow fan. Fan inputs measure the period of tachometer pulses from the fans, providing a higher count for lower fan speeds. The right-side header contains the fan inputs, labeled F1 and F2, that can be programmed to accept either fan failure indicator programmed to be active high or active low or tachometer signals. The AMC80 also possesses a general reset signal routed on the RST pin of the mikroBUS™ socket to reset the AMC80, and an additional interrupt signal, routed on the INT pin of the mikroBUS™ socket whenever some of the external interrupts like INT_OUT, interrupt from the temperature sensor, or when a chassis detection event occurs. The INT IN active low interrupt provides a way to chain the interrupts from other devices through the AMC80 to the host, the RST O is intended to provide a master reset to devices connected to this line, while the GPO pin is an active low NMOS open drain output intended to drive an external power PMOS for software power control or can be utilized to control power to a cooling fan. Next in this board's series of additional features are an external interrupt input INT IN, a master reset for external purposes RST O, and a single power switch pin GPO. The chassis intrusion input is designed to accept an active high signal from an external circuit that latches, such as when the cover is removed from the computer. On the same header, in addition to the BTI pin, there is also a GPI pin, which, in addition to its function as a general-purpose input pin, can also serve as a chassis intrusion detection input. Temperature can be converted to a 9-bit or 12-bit two's complement word with resolutions of 0.5☌ or 0.0625☌ LSB, respectively. The AMC80 is especially suited to interface with linear and digital temperature sensors such as TMP75 via the BTI pin on the left unpopulated header. Also, the AMC80 allows choosing the least significant bits (LSB) of its I2C slave address using the SMD jumpers labeled ADDR SEL. The AMC80 includes an analog filter on the I2C lines that improves noise immunity and supports the timeout reset function on SDA and SCL pins, preventing I2C bus lockup. This Click board™ communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings with a maximum frequency of 400kHz. The analog inputs are intended to be connected to the several power supplies present in a typical communications infrastructure system. It continuously converts analog inputs to 10-bit resolution with a 2.5mV LSB, yielding input ranges of 0 to 2.56V. The AMC80 provides seven analog inputs spread across the terminals on the top of the board labeled from CH0 to CH6, a temperature sensor, an ADC, two fan speed counters, and various inputs and outputs on a single chip. HW Monitor 2 Click is based on the AMC80, a system hardware monitor from Texas Instruments that performs power supply, temperature, and fan monitoring for various embedded systems. This Click board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket. HW Monitor 2 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click board™ is suitable for system thermal and hardware monitoring for various servers, electronic test equipment and instrumentation, communications infrastructure, consumer electronics, and more. The AMC80 also has two programmable fan speed monitoring inputs besides other hardware monitoring functions like chassis intrusion detection, additional external interrupt input, and master reset for external purposes, as well as a programmable upper over-limit and lower under-limit alarms that activate when the programmed limits are exceeded. This board features the AMC80, an I2C-configurable system hardware monitor from Texas Instruments that contains a 10-bit ADC capable of measuring seven positive voltages and local temperature. HW Monitor 2 Click is a compact add-on board used to monitor and regulate the performance of various hardware components within an embedded system.
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