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参数资料
| 型号： | ADM1276-3ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 27/48页 |
| 文件大小： | 0K |
| 描述： | IC HOT SWAP CTLR PMBUS 20LFCSP |
| 标准包装： | 5,000 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电流限制： | 可调 |
| 电源电压： | 2.95 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘，CSP |
| 供应商设备封装： | 20-LFCSP-WQ（5x5） |
| 包装： | 带卷 (TR) |
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Data Sheet
A group command differs from a nongroup command in that
after the data is written to one slave device, a repeated start
condition is placed on the bus followed by the address of the
next slave device and data. This continues until all of the
devices have been written to, at which point the stop condition
is placed on the bus by the master device.
The format of a group command and a group command with
Each device that is written to as part of the group command
does not immediately execute the command written. The device
must wait until the stop condition appears on the bus. At that
point, all devices execute their commands at the same time.
Using a group command, it is possible, for example, to turn
multiple PMBus devices on or off simultaneously. In the case of
the ADM1276 , it is also possible to issue a power monitor
command that initiates a conversion, causing multiple ADM1276
devices to sample together at the same time.
HOT SWAP CONTROL COMMANDS
OPERATION Command
The GATE pin that drives the FET is controlled by a dedicated
hot swap state machine. The UV and OV input pins, the TIMER
and SS pins, and the current sense all feed into the state machine
and they control when and how strongly the gate is turned off.
It is also possible to control the hot swap GATE output using
commands over the PMBus interface. The OPERATION
command can be used to request the hot swap output to turn
on. However, if the UV pin indicates that the input supply is less
than required, the hot swap output is not turned on, even if the
OPERATION command indicates that the output should be
enabled.
If the OPERATION command is used to disable the hot swap
output, the GATE pin is held low, even if all hot swap state
machine control inputs indicate that it can be enabled.
The default state of Bit 7 (also named the on bit) of the
OPERATION command is 1; therefore, the hot swap output
is always enabled when the ADM1276 emerges from UVLO.
If the on bit is never changed, the UV input or the ENABLE
input is the hot swap master on/off control signal.
By default at power-up, the OPERATION command is disabled
and must be enabled using the DEVICE_CONFIG command.
This prevents inadvertent shutdowns of the hot swap controller
by software.
If the on bit is set to 0 while the UV signal is high, the hot swap
output is turned off. If the UV signal is low or if the OV signal
is high, the hot swap output is already off and the status of the
on bit has no effect.
If the on bit is set to 1, the hot swap output is requested to turn
on. If the UV signal is low or if the OV signal is high, setting the
on bit to 1 has no effect, and the hot swap output remains off.
ADM1276
It is possible to determine at any time whether the hot swap output
is enabled using the STATUS_BYTE or the STATUS_WORD
command (see the Status Commands section).
The OPERATION command can also clear any latched faults in
the status registers. To clear latched faults, set the on bit to 0 and
then reset it to 1.
DEVICE_CONFIG Command
The DEVICE_CONFIG command configures certain settings
within the ADM1276 , for example, enabling or disabling foldback
in the hot swap controller, or modifying the duration of the
severe overcurrent glitch filter. This command is also used to
configure the polarity of the second IOUT current warnings.
The OPERATION command is disabled at power-up. If the
OPERATION command is received, the ADM1276 responds
with a no acknowledge. To allow use of the OPERATION
command, the OPERATION_CMD_EN bit must be set via
the DEVICE_CONFIG command.
POWER_CYCLE Command
The POWER_CYCLE command can be used to request that the
ADM1276 be turned off for ~4 seconds and then turned back on.
This command can be useful if the processor that controls the
ADM1276 is also powered off when the ADM1276 is turned off.
This command allows the processor to request that the ADM1276
turn off and on again as part of a single command.
ADM1276 INFORMATION COMMANDS
CAPABILITY Command
The CAPABILITY command can be used by host processors
to determine the I 2 C bus features that are supported by the
imum bus speed, whether the device supports the packet error
checking (PEC) byte, and the SMBAlert reporting function.
PMBUS_REVISION Command
The PMBUS_REVISION command reports the version of Part I
and Part II of the PMBus standard.
MFR_ID, MFR_MODEL, and MFR_REVISION Commands
The MFR_ID, MFR_MODEL, and MFR_REVISION commands
return ASCII strings that can be used to facilitate detection and
identification of the ADM1276 on the bus.
These commands are read using the SMBus block read message
type. This message type requires that the ADM1276 return a
byte count corresponding to the length of the string data that is
to be read back.
STATUS COMMANDS
The ADM1276 provides a number of status bits that are used
to report faults and warnings from the hot swap controller and
the power monitor. These status bits are located in six different
registers that are arranged in a hierarchy. The STATUS_BYTE
and STATUS_WORD commands provide 8 bits and 16 bits of
high level information, respectively. The STATUS_BYTE and
STATUS_WORD commands contain the most important status
Rev. C | Page 27 of 48
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| ADM1278-1AACPZ | 功能描述:Hot Swap Controller, Monitor 1 Channel General Purpose 32-LFCSP (5x5) 制造商:analog devices inc. 系列:- 包装:托盘 零件状态:有效 类型:热交换控制器，监控器 通道数:1 内部开关:无 应用:通用 特性:PMBus 可编程特性:自动重试，限流，故障超时，闭锁故障，OVP，压摆率，UVLO 电压 - 电源:4.5 V ~ 20 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:5.5mA 安装类型:表面贴装 封装/外壳:32-WFQFN 裸露焊盘，CSP 供应商器件封装:32-LFCSP（5x5） 功能引脚:- 标准包装:1 |
| ADM1278-1AACPZ-RL | 功能描述:Hot Swap Controller, Monitor 1 Channel General Purpose 32-LFCSP-WQ (5x5) 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:有效 类型:热交换控制器，监控器 通道数:1 内部开关:无 应用:通用 特性:PMBus 可编程特性:自动重试，限流，故障超时，闭锁故障，OVP，压摆率，UVLO 电压 - 电源:4.5 V ~ 20 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:5.5mA 安装类型:表面贴装 封装/外壳:32-WFQFN 裸露焊盘，CSP 供应商器件封装:32-LFCSP-WQ（5x5） 功能引脚:- 标准包装:5,000 |
| ADM1278-1ACPZ | 功能描述:Hot Swap Controller, Monitor 1 Channel General Purpose 32-LFCSP (5x5) 制造商:analog devices inc. 系列:- 包装:托盘 零件状态:有效 类型:热交换控制器，监控器 通道数:1 内部开关:无 应用:通用 特性:PMBus 可编程特性:自动重试，限流，故障超时，闭锁故障，OVP，压摆率，UVLO 电压 - 电源:4.5 V ~ 20 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:5.5mA 安装类型:表面贴装 封装/外壳:32-WFQFN 裸露焊盘，CSP 供应商器件封装:32-LFCSP（5x5） 功能引脚:- 标准包装:1 |
| ADM1278-1ACPZ-RL | 功能描述:IC ENERGY MON HOT-SWAP 32-LFCSP 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:在售 类型:热交换控制器，监控器 通道数:1 内部开关:无 应用:通用 特性:PMBus 可编程特性:自动重试，限流，故障超时，闭锁故障，OVP，压摆率，UVLO 电压 - 电源:4.5 V ~ 20 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:5.5mA 安装类型:表面贴装 封装/外壳:32-WFQFN 裸露焊盘，CSP 供应商器件封装:32-LFCSP-WQ（5x5） 功能引脚:- 标准包装:1 |
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