EVAL-ADM1021AEB【PDF 12/16 页】BOARD EVAL FOR ADM1021

您好，
买卖IC网欢迎您。
请登录
免费注册

Sheet目录1214

8页 9页 10页 11页 [12页]13页 14页 15页 16页

ADM1021A

1

9

1

9

SCLK

SDATA

A6

A5

A4

A3

A2

A1

A0

R/W

D7

D6

D5

D4

D3

D2

D1

D0

FRAME 2

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

ACK. BY

ADM1021A

ACK. BY

ADM1021A

ADDRESS POINTER REGISTER BYTE

STOP BY

MASTER

Figure 15. Writing to the Address Pointer Register Only

1

9

1

9

SCLK

SDATA

A6

A5

A4

A3

A2

A1

A0 R/W

D7

D6

D5

D4

D3

D2

D1

D0

FRAME 2

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

ACK. BY

ADM1021A

NO ACK. BY

MASTER

DATA BYTE FROM ADM1021A

STOP BY

MASTER

Figure 16. Reading Data from a Previously Selected Register

When reading data from a register there are two

possibilities:

1. If the ADM1021A’s address pointer register value

is unknown or not the desired value, it is first

necessary to set it to the correct value before data

can be read from the desired data register. This is

done by performing a write to the ADM1021A as

before, but only the data byte containing the

register read address is sent, because data is not to

be written to the register. This is shown in

Figure 15.

A read operation is then performed consisting of

the serial bus address, R/W bit set to 1, followed

by the data byte read from the data register. This is

shown in Figure 16.

2. If the address pointer register is known to be

ALERT Output

The ALERT output goes low whenever an out-of-limit

measurement is detected, or if the remote temperature sensor

is open-circuit. It is an open drain and requires a 10 k W

pullup to V DD . Several ALERT outputs can be wire-ANDed

togethe r so the common line goes low if one or more of the

ALERT outputs goes low.

The ALERT output can be used as an interrupt signal to a

processor, or it can be used as an SMBALERT. Slave devices

on the SMBus cannot normally signal to the master that they

want to talk, but the SMBALERT function allows them to do

so.

One or more ALERT outputs are connected to a common

SMBALERT line connected to the master. When the

SMBALERT line is pulled low by one of the devices, the

following procedure occurs, as shown in Figure 17.

START

already at the desired address, data can be read

from the corresponding data register without first

writing to the address pointer register, so Figure 15

can be omitted.

MASTER RECEIVES SMBALERT

ALERT RESPONSE

ADDRESS

MASTER SENDS

ARA AND READ

COMMAND

RD ACK

DEVICE

ADDRESS

DEVICE SENDS

ITS ADDRESS

NO

ACK

STOP

NOTES:Although it is possible to read a data byte from a data

register without first writing to the address pointer register,

if the address pointer register is already at the correct value,

it is not possible to write data to a register without writing to

the address pointer register; this is because the first data

byte of a write is always written to the address pointer

register.

Remember that the ADM1021A registers have different

addresses for read and write operations. The write address

of a register must be written to the address pointer if data is

to be written to that register, but it is not possible to read data

from that address. The read address of a register must be

written to the address pointer before data can be read from

that register.

Figure 17. Use of SMBALERT

1. SMBALERT is pulled low.

2. Master initiates a read operation and sends the

alert response address (ARA = 0001 100). This is

a general call address that must not be used as a

specific device address.

3. The device whose ALERT output is low responds

to the alert response address and the master reads

its device address. The address of the device is

now known and it can be interrogated in the usual

way.

4. If more than one device’s ALERT output is low,

the one with the lowest device address has priority,

in accordance with normal SMBus arbitration.

http://onsemi.com

12

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

我的联系方式

*

*

*

相关PDF资料

EVAL-ADM1023EB BOARD EVAL FOR ADM1023

EVAL-ADM1031EB BOARD EVAL FOR ADM1031

EVAL-ADM1062TQEBZ BOARD EVALUATION FOR ADM1062TQ

EVAL-ADM1075CEBZ BOARD EVAL FOR ADM1075

EVAL-ADM1087EBZ BOARD EVALUATION FOR ADM1087

EVAL-ADM1166TQEBZ BOARD EVAL FOR ADM1166TQ

EVAL-ADM1168LQEBZ BOARD EVAL FOR ADM1168LQ

EVAL-ADM1170EBZ BOARD EVALUATION FOR ADM1170

相关代理商/技术参数

EVAL-ADM1022 制造商:AD 制造商全称:Analog Devices 功能描述:Evaluation Board for Microprocessor System Temperature Monitor

EVAL-ADM1023 制造商:AD 制造商全称:Analog Devices 功能描述:Evaluation Board for Microprocessor System Temperature Monitor

EVAL-ADM1023EB 功能描述:BOARD EVAL FOR ADM1023 RoHS:否类别:编程器，开发系统 >> 过时/停产零件编号系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB）传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否已供物品:成像器板已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP

EVAL-ADM1024EBZ 制造商:ON Semiconductor 功能描述:EVALUATION BOARD I.C. - Boxed Product (Development Kits)

EVAL-ADM1026EB 制造商:AD 制造商全称:Analog Devices 功能描述:Complete Thermal and System Management Controller

EVAL-ADM1028 制造商:AD 制造商全称:Analog Devices 功能描述:Evaluation Board for PC Temperature Monitor and Fan Control ASIC

EVAL-ADM1030 制造商:AD 制造商全称:Analog Devices 功能描述:Evaluation Board for ACPI Temperature Monitor and PWM Fan Controller

EVAL-ADM1031 制造商:AD 制造商全称:Analog Devices 功能描述:Evaluation Board for ACPI Temperature Monitor and PWM Fan Controller