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参数资料
| 型号： | ADM1276-3ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 30/48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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ADM1276
All comparisons performed by the power monitor require the
measured value to be strictly greater or less than the threshold
value.
At power-up, all threshold limits are set to either minimum
scale (for undervoltage or undercurrent conditions) or to
maximum scale (for overvoltage or overcurrent or overpower
conditions). This effectively disables the generation of any
status warnings by default; warning bits are not set in the status
registers until the user explicitly sets the threshold values.
VIN_OV_WARN_LIMIT and VIN_UV_WARN_LIMIT
Commands
The VIN_OV_WARN_LIMIT and VIN_UV_WARN_LIMIT
commands are used to set the OV and UV thresholds on the
input voltage, as measured at the SENSE+ pin.
VOUT_OV_WARN_LIMIT and VOUT_UV_WARN_LIMIT
Commands
The VOUT_OV_WARN_LIMIT and VOUT_UV_WARN_
LIMIT commands are used to set the OV and UV thresholds
on the output voltage, as measured at the VOUT pin.
IOUT_OC_WARN_LIMIT Command
The IOUT_OC_WARN_LIMIT command sets the OC
threshold for the current flowing through the sense resistor.
IOUT_WARN2_LIMIT Command
The IOUT_WARN2_LIMIT command provides a second
current warning threshold that can be programmed. The
polarity of this warning can be set to overcurrent or
undercurrent using the DEVICE_CONFIG command.
PIN_OP_WARN_LIMIT Command
The PIN_OP_WARN_LIMIT command is used to set the
overpower threshold for the power delivered to the load.
PMBus DIRECT FORMAT CONVERSION
The ADM1276 uses the PMBus direct format to represent real-
world quantities such as voltage, current, and power values. A
direct format number takes the form of a 2-byte, twos complement,
binary integer value.
It is possible to convert between direct format value and real-
world quantities using the following equations. Equation 1
converts from real-world quantities to PMBus direct values, and
Equation 2 converts PMBus direct format values to real-world
values.
Y = ( mX + b ) × 10 R (1)
Data Sheet
The same equations are used for voltage, current, and power
conversions, the only difference being the values of the m, b,
and R coefficients that are used.
current and power coefficients shown are dependent on the
value of the external sense resistor used in a given application.
This means that an additional calculation must be performed to
take the sense resistor value into account to obtain the coefficients
for a specific sense resistor value.
The sense resistor value used in the calculations to obtain the
coefficients is expressed in milliohms. The m coefficients are
defined as 2-byte twos complement numbers in the PMBus
standard, therefore the maximum positive value that can be
represented is 32,767. If the m value is greater than that, and is
to be stored in PMBus standard form, then the m coefficients
should be divided by 10, and the R coefficient increased by a
value of 1. For example, if on the 20 V range, a 10 milliohm
sense resistor is used, the m coefficient is 6043, and the R
coefficient is ?1.
Example 1: IOUT_OC_WARN_LIMIT requires a current-limit
value expressed in direct format.
If the required current limit is 10 A, and the sense resistor is
2 mΩ, then the first step is to determine the voltage coefficient.
This is simply m = 807 × 2, giving 1614.
Using Equation 1, and expressing X, in units of Amps
Y = ((1614 × 10) + 20,475) × 10 ?1
Y = 3661.5 = 3662 (rounded up to integer form)
Writing a value of 3662 with the IOUT_OC_WARN_LIMIT
command sets an overcurrent warning at 10 A.
Example 2: The READ_IOUT command returns a direct format
value of 3339 representing the current flowing through a sense
resistor of 1 m?.
To convert this value to the current flowing, use Equation 2, with
m = 807 × 1.
X = 1/807 × (3339 × 10 1 ? 20,475)
X = 16.00 A
This means that when READ_IOUT returns a value of 3339,
16.00 A is flowing in the sense resistor.
There are two input voltage ranges, so there are also two sets of
coefficients for converting to and from the power value, depending
on which voltage range is selected.
X = 1/ m × ( Y × 10 ? b )
?R
(2)
Note the following:
where:
Y is the value in PMBus direct format.
X is the real-world value.
m is the slope coefficient, a 2-byte, twos complement integer.
b is the offset, a 2-byte, twos complement integer.
R is a scaling exponent, a 1-byte, twos complement integer.
?
?
The same calculations that are used to convert power
values also apply to the energy accumulator value returned
by the READ_EIN command because the energy
accumulator is a summation of multiple power values.
The READ_PIN_EXT and READ_EIN_EXT commands
return 24-bit extended precision versions of the 16-bit
values returned by READ_PIN and READ_EIN. The direct
Rev. C | Page 30 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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