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ADM1025ARQ-REEL7 데이터시트(PDF) 9 Page - ON Semiconductor |
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ADM1025ARQ-REEL7 데이터시트(HTML) 9 Page - ON Semiconductor |
9 / 21 page Preliminary Technical Data ADM1025/ADM1025A Rev. P5 | Page 9 of 21| www.onsemi.com GENERAL DESCRIPTION The ADM1025/ADM1025A is a complete system hardware monitor for microprocessor-based systems. The device communicates with the system via a serial System Management Bus. The serial bus controller has a hardwired address line for device selection (Pin 16), a serial data line for reading and writing addresses and data (Pin 1), and an input line for the serial clock (Pin 2). All control and programming functions of the ADM1025/ADM1025A are performed over the serial bus. MEASUREMENT INPUTS The device has six measurement inputs, five for voltage and one for temperature. It can also measure its own supply voltage and can measure ambient temperature with its on-chip temperature sensor. Pins 11 through 15 are analog inputs with on-chip attenuators configured to monitor 12 V, 5 V, 3.3 V, 2.5 V, and the processor core voltage, respectively. Pin 11 may alternatively be programmed as a digital input for Bit 4 of the processor voltage ID code. Power is supplied to the chip via Pin 4, and the system also monitors the voltage on this pin. Remote temperature sensing is provided by the D+ and D− inputs, to which a diode-connected, external temperature- sensing transistor may be connected. An on-chip band gap temperature sensor monitors system ambient temperature. SEQUENTIAL MEASUREMENT When the ADM1025/ADM1025A monitoring sequence is started, it cycles sequentially through the measurement of analog inputs and the temperature sensors. 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 Status Registers, which can be read over the serial bus to flag out of limit conditions. PROCESSOR VOLTAGE ID Five digital inputs (VID4 to VID0—Pins 5 to 8 and 11) read the processor voltage ID code and store it in the VID registers, from which it can be read out by the management system over the serial bus. If Pin 11 is configured as a 12 V analog input (power- up default), the VID4 bit in the VID4 register will default to 0. The VID pins have internal 100 kΩ pull-up resistors (ADM1025 only). ADD/RST/INT/NTO Pin 16 is a programmable digital I/O pin. After power-up, at the first sign of SMBus activity, it is sampled to set the lowest two bits of the serial bus address. During board-level, NAND tree connectivity testing, this pin functions as the output of the NAND tree. During normal operation, Pin 16 may be programmed as a reset output to provide a low going 20 ms reset pulse when enabled, or it may be programmed as an interrupt output for out-of-limit temperature and/or voltage events. These functions are described in more detail later. INTERNAL REGISTERS OF THE ADM1025/ADM1025A A brief description of the ADM1025/ADM1025A’s principal internal registers is given below. More detailed information on the function of each register is given in Table 8 to Table 18. Configuration Register: Provides control and configuration. Address Pointer Register: This register contains the address that selects one of the other internal registers. When writing to the ADM1025/ADM1025A, the first byte of data is always a register address, which is written to the Address Pointer Register. Status Registers: Two registers to provide status of each limit comparison. VID Registers: The status of the VID0 to VID4 pins of the processor can read from these registers. Value and Limit Registers: The results of analog voltage inputs and temperature measurements are stored in these registers, along with their limit values. Offset Register: Allows either an internal or external temperature channel reading to be offset by a twos complement value written to this register. SERIAL BUS INTERFACE Control of the ADM1025/ADM1025A is carried out via the serial bus. The ADM1025/ADM1025A is connected to this bus as a slave device, under the control of a master device or master controller. The ADM1025/ADM1025A has a 7-bit serial bus address. When the device is powered up, it will do so with a default serial bus address. The five MSBs of the address are set to 01011; the two LSBs are determined by the logical states of Pin 16 at power-up. This is a three-state input that can be grounded, connected to VCC, or left open-circuit to give three different addresses: Table 4. Address Selection ADD Pin A1 A0 GND 0 0 No Connect 1 0 VCC 0 1 |
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