参数资料
| 型号： | ADM1025ARQZ-R7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/19页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR SYS/VOLT 5CH 16QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Obsolescence 11/Feb/2009 |
| 标准包装： | 1,000 |
| 应用： | PC，PDA |
| 接口： | I²C |
| 电源电压： | 3 V ~ 5.5 V |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
ADM1025, ADM1025A
http://onsemi.com
7
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 onchip
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 (powerup default), the VID4 bit in the VID4
register will default to 0.
The VID pins have internal 100 k
W 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 Register 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
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 5. ADDRESS SELECTION
ADD Pin
A1
A0
GND
0
No Connect
1
0
VCC
0
1
If ADD is left open-circuit, the default address will be
0101110. ADD is sampled only after power-up, so any
changes made will have no effect, unless power is cycled.
The facility to make hardwired changes to A1 and A0
allows the user to avoid conflicts with other devices sharing
the same serial bus if, for example, more than one
ADM1025/ADM1025A is used in a system. However, as
previously mentioned, the ADD pin may also function as a
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