データシートサーチシステム |
|
ADM1024ARUZ データシート(PDF) 8 Page - ON Semiconductor |
|
ADM1024ARUZ データシート(HTML) 8 Page - ON Semiconductor |
8 / 29 page ADM1024 http://onsemi.com 8 General Description The ADM1024 is a complete system hardware monitor for microprocessor−based systems. The device communicates with the system via a serial SMBus. The serial bus controller has a hardwired address line for device selection (Pin 1), a serial data line for reading and writing addresses and data (SDA, Pin 14), and an input line for the serial clock (Pin 3), and an input line for the serial clock (Pin 4). All control and programming functions of the ADM1024 are performed over the serial bus. Measurement Inputs Programmability of the measurement inputs makes the ADM1024 extremely flexible and versatile. The device has a 10−bit ADC and nine measurement input pins that can be configured in different ways. Pins 5 and 6 can be programmed as general−purpose analog inputs with a range of 0 V to 2.5 V, or as digital inputs to monitor the speed of fans with digital tachometer outputs. The fan inputs can be programmed to accommodate fans with different speeds and different numbers of pulses per revolution from their tachometer outputs. Pins 13 and 14 are dedicated temperature inputs and may be connected to the cathode and anode of an external temperature sensing diode. Pins 15, 16, and 19 are dedicated analog inputs with on−chip attenuators, configured to monitor 12 V, 5.0 V, and the processor core voltage, respectively. Pins 17 and 18 may be configured as analog inputs with on−chip attenuators to monitor a second processor core voltage and a 2.5 V supply, or they may be configured as a temperature input and connected to a second temperature−sensing diode. The ADC also accepts input from an on−chip band gap temperature sensor that monitors system−ambient temperature. Finally, the ADM1024 monitors the supply from which it is powered, so there is no need for a separate 3.3 V analog input if the chip VCC is 3.3 V. The range of this VCC measurement can be configured for either a 3.3 V or 5.0 V VCC by Bit 3 of the Channel Mode Register. Sequential Measurement When the ADM1024 monitoring sequence is started, it cycles sequentially through the measurement of analog inputs and the temperature sensor, while at the same time the fan speed inputs are independently monitored. Measured values from these inputs are stored in Value Registers. These can be read out over the serial bus, or can be compared with programmed limits stored in the Limit Registers. The results of out−of−limit comparisons are stored in the Interrupt Status Registers, and will generate an interrupt on the INT line (Pin 10). Any or all of the Interrupt Status Bits can be masked by appropriate programming of the Interrupt Mask Register. Processor Voltage ID Five digital inputs (VID4 to VID0—Pins 20 to 24) read the processor voltage ID code. These inputs can also be reconfigured as interrupt inputs. The VID pins have internal 100 k W pullup resistors. Chassis Intrusion A chassis intrusion input (Pin 7) is provided to detect unauthorized tampering with the equipment. RESET A RESET input/output (Pin 12) is provided. Pulling this pin low will reset all ADM1024 internal registers to default values. The ADM1024 can also be programmed to give a low going 45 ms reset pulse at this pin. Analog Output The ADM1024 contains an on−chip, 8−bit DAC with an output range of 0 V to 2.5 V (Pin 11). This is typically used to implement a temperature−controlled fan by controlling the speed of a fan dependent upon the temperature measured by the on−chip temperature sensor. Testing of board level connectivity is simplified by providing a NAND tree test function. The AOUT (Pin 11) also doubles as a NAND test input, while Pin 1 doubles as a NAND tree output. Internal Registers of the ADM1024 A brief description of the ADM1024’s principal internal registers follows. More detailed information on the function of each register is given in Table 6 to Table 19: ♦ Configuration Registers: Provide control and configuration. ♦ Channel Mode Register: Stores the data for the operating modes of the input channels. ♦ Address Pointer Register: This register contains the address that selects one of the other internal registers. When writing to the ADM1024, the first byte of data is always a register address, which is written to the Address Pointer Register. ♦ Interrupt (INT) Status Registers: Two registers to provide status of each interrupt event. These registers are also mirrored at addresses 4Ch and 4Dh. ♦ Interrupt (INT) Mask Registers: Allow masking of individual interrupt sources. ♦ Temperature Configuration Register: The configuration of the temperature interrupt is controlled by the lower three bits of this register. ♦ VID/Fan Divisor Register: The status of the VID0 to VID4 pins of the processor can be written to and read from these registers. Divisor values for fan speed measurement are also stored in this register. |
同様の部品番号 - ADM1024ARUZ |
|
同様の説明 - ADM1024ARUZ |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |