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參數(shù)資料
| 型號(hào)： | ADM1025 |
| 廠商： | Analog Devices, Inc. |
| 元件分類(lèi)： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:8; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:17-8 |
| 中文描述： | 低成本PC硬件監(jiān)視器的ASIC |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 164K |
| 代理商： | ADM1025 |
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REV. A
ADM1025/ADM1025A
–13–
USING THE ADM1025/ADM1025A
Power-On RESET
When power is first applied, the ADM1025/ADM1025A per-
forms a “power- on reset” on several of its registers. Registers
whose power-on values are not shown have power-on conditions
that are indeterminate. Value and limit registers are reset to 00h
on power-up. The ADC is inactive. In most applications, usu-
ally the first action after power-on would be to write limits into
the Limit Registers.
Power-on reset clears or initializes the following registers (the
initialized values are shown in Table VI):
– Configuration Register
– Status Registers #1 and #2
– VID0-3 Register
– VID4 Register
– Test Register
INITIALIZATION
Configuration Register Initialization performs a similar, but not
identical, function to power-on reset.
Configuration Register Initialization is accomplished by setting
Bit 7 of the Configuration Register high. This bit automatically
clears after being set.
USING THE CONFIGURATION REGISTER
Control of the ADM1025/ADM1025A is provided through the
configuration register. The Configuration Register is used to
start and stop the ADM1025/ADM1025A, programming the
operating modes of Pins 11 and 16, and provide the initializa-
tion function described above.
Bit 0 of the Configuration Register controls the monitoring loop
of the ADM1025/ADM1025A. Setting Bit 0 low stops the moni-
toring loop and puts the ADM1025/ADM1025A into a low power
mode thereby reducing power consumption. Serial bus commu-
nication is still possible with any register in the ADM1025/
ADM1025A while in low power mode. Setting Bit 0 high starts
the monitoring loop.
Bit 4 of the Configuration Register causes a low going 20 ms (typ)
pulse at the
RST
pin (Pin 16) when set. This bit is self-clearing.
Bit 5 of the Configuration Register selects the operating mode of
pin 11 between the default of 12 V analog input (Bit 5 = 0) and
VID4 (Bit 5 = 1).
Bit 7 of the Configuration Register is used to start a Configura-
tion Register Initialization when it is set to 1.
USING THE OFFSET REGISTER
This register contains a two’s complement value that is added
(or subtracted if the number is negative) to either the internal or
external temperature reading. Note that the default value in the
offset register is zero, so zero is always added to the temperature
reading. The offset register is configured for the external tem-
perature channel by default. It may be switched to the internal
channel by setting Bit 0 of the Test Register to 1, setting Bit 6 of
the VID Register to 1, and clearing Bit 7 of the VID Register.
STARTING CONVERSION
The monitoring function of the ADM1025/ADM1025A is started
by writing to the Configuration Register and setting Start (Bit 0),
high. Limit values should be written into the Limit Registers
before starting the ADC to avoid spurious out-of-limit condi-
tions. The time taken to complete the analog measurements
depends on how they are configured, as described elsewhere.
Once the measurements have been completed, the results can be
read from the Value Registers at any time.
REDUCED POWER AND SHUTDOWN MODE
The ADM1025/ADM1025A can be placed in a low power
mode by setting Bit 0 of the Configuration Register to 0. This
disables the internal ADC. Full shutdown mode may then be
achieved by setting Bit 7 of the VID Register to 1 AND Bit 0 of
the Test Register to 1. This turns off power to all analog circuits
and stops the monitoring cycle, if running, but it does not affect
the condition of any of the registers. The device will return to its
previous state when these bits are reset to zero.
5 V OPERATION
The ADM1025/ADM1025A may be operated with V
CC
con-
nected to any supply voltage between 3.0 V and 5.5 V, but it
should be noted that the device has been optimized for 3.3 V
operation. In particular, the internal voltage divider used to
measure the supply voltage is optimized for 3.3 V. Powering the
device from 5 V will cause the V
CC
Reading Register (Register
25h) to overrange. In this case, the 5 V measurement should be
read from the 5 V Reading Register (Register 23h), instead of
the V
CC
Reading Register. Note also that when 12 V
IN
/VID4 pin
is programmed to read VID4, due to its internal voltage divider,
it will only read V
IH
= 2.1 V on 12 V
IN
/VID4 pin as logic high if
device is being powered from 3.3 V supply.
REGISTERS
Table V. Address POINTER Register
Bit
Name
R/
W
Description
7–0
Address Pointer
Write
Address of ADM1025/
ADM1025A Registers. See
the tables below for detail.
Table VI. List of Registers
Address
A7–A0
in Hex
Power On
Value of
Registers: <7:0>
Register
Name
Configuration Register
Status Register 1
Status Register 2
VID Register
40h
41h
42h
47h
0000 1000
0000 0000
0000 0000
<7:4> = 0000, <3:0> =
VID3–VID0
<0> = VID4; Default =
1000 000 (VID4)
VID4 Register
49h
Value and Limit
Registers
Company ID
Stepping
15–3Dh
3Eh
3Fh
0100 0001
0010 (Bits 3:0 Version
Number)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADM1025A | Circular Connector; No. of Contacts:8; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:17-8 |
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| ADM1025AARQ-REEL | 制造商:Rochester Electronics LLC 功能描述:PC HARDWARE MONITOR I.C. - Tape and Reel |
| ADM1025AARQZ | 功能描述:IC MONITOR SYS/VOLT 5CH 16QSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤(pán)（4x4） 包裝:帶卷 (TR) 安裝類(lèi)型:表面貼裝 產(chǎn)品目錄頁(yè)面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
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