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参数资料
| 型号： | MAX5980GTJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/49页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PD IEEE 802.3AF 32TQFN |
| 标准包装： | 2,500 |
| 类型： | 以太网供电控制器 PD 开关（PoE） |
| 应用： | 供电设备（PSE） |
| 内部开关： | * |
| 电流限制： | * |
| 电源电压： | * |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
Detailed Description
The MAX5980 is a quad PSE power controller designed
for use in IEEE 802.3at/af-compliant PSE. This device
provides PD discovery, classification, current limit, and
load disconnect detections. The device supports both
fully automatic operation and software programmability.
The device also supports new 2-event classification and
Class 5 for detection and classification of high-power
PDs. The device supports single-supply operation, pro-
vides up to 70W to each port (Class 5 enabled), and still
provides high-capacitance detection for legacy PDs.
The device features an I 2 C-compatible, 3-wire serial
interface, and is fully software configurable and pro-
grammable. The device provides instantaneous readout
of port current and voltage through the I 2 C interface.
The device provides input undervoltage lockout (UVLO),
input overvoltage lockout (OVLO), overtemperature pro-
tection, and output voltage slew-rate limit during startup.
Reset
The device is reset by any of the following conditions:
1) Power-up/down. Reset condition is asserted once
V EE falls below the UVLO threshold.
2) Hardware reset. To initiate a hardware reset, pull
EN low to DGND for at least 100 F s. Hardware reset
clears once, EN returns high to V DD , and all registers
are set to their default states.
3) Software reset. To initiate a software reset, write a
logical 1 to the RESET_IC register (R1Ah[4]) any time
after power-up. Reset clears automatically, and all
registers are set to their default states.
4) Thermal shutdown. The device enters thermal shut-
down at +140 N C. The device exits thermal shutdown
and is reset once the temperature drops below
120 N C.
During normal operation, changes to the address inputs,
MIDSPAN, EN_CL5, and AUTO are ignored, and they
can be changed at any time prior to a reset state. At the
end of a reset event, the device latches in the state of
these inputs.
Port Reset
Set RESET_P_ (R1Ah[3:0]) high anytime during normal
powered operation to turn off port_, disable detection
and classification, and clear the Port_ Event and Status
registers. If a port is not powered, setting RESET_P_ high
for that port has no effect. Individual port reset does not
Midspan Mode
In midspan mode, the device adopts cadence timing
during the detection phase. When cadence timing is
enabled and a failed detection occurs, the ports wait
at least 2s before attempting to detect again. Midspan
mode is activated by setting MIDSPAN high and then
powering or resetting the device. Alternatively, midspan
mode can be software programmed individually for
each port by setting MIDSPAN_ (R15h[3:0], Table 23) to
a logical 1. By default, the MIDSPAN input is internally
pulled high, enabling cadence timing. Force MIDSPAN
low to disable this function.
Operation Modes
The device provides four operating modes to suit differ-
ent system requirements. By default, auto mode allows
the device to operate automatically at its default settings
without any software. Semiautomatic mode automatically
detects and classifies devices connected to the ports,
but does not power a port until instructed to by software.
Manual mode allows total software control of the device
and is useful for system diagnostics. Shutdown mode
terminates all activities and securely turns off power to
the ports.
Switching between auto, semiautomatic, and manual
mode does not interfere with the operation of an out-
put port. When a port is set into shutdown mode, all
port operations are immediately stopped and the port
remains idle until shutdown mode is exited.
Auto (Automatic) Mode
By default, when the auto input is unconnected, the
device enters auto mode after power-up or when the
reset condition is cleared. To manually place a port into
auto mode from any other mode, set the corresponding
port mode bits (R12h[7:0]) to [11] (Table 19).
In auto mode, the device performs detection, classifica-
tion, and powers up the port automatically if a valid PD
is connected to the port. If a valid PD is not connected
at the port, the device repeats the detection routine con-
tinuously until a valid PD is connected.
When entering auto mode after a reset condi-
tion (state of AUTO input), the DET_EN_ and
CLASS_EN_ bits (R14h[7:0], Table 22) are set to high
and stay high, unless changed by software. When enter-
ing auto mode from any other mode due to a software
command (programmed with R12h[7:0], Table 19, the
DET_EN_ and CLASS_EN_ bits retain their previous state.
initiate a global device reset.
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5980UTJ+ | 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| MAX5980UTJ+T | 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| MAX5981AETE+ | 功能描述:热插拔功率分布 IEEE 802.3af/at PDIC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5981AETE+T | 功能描述:热插拔功率分布 IEEE 802.3af/at PDIC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5981AEVKIT# | 制造商:Maxim Integrated Products 功能描述:EVKIT FOR POWERED DEVICE INTERFACE CONTROLLERS WITH INTEGRAT - Boxed Product (Development Kits) 制造商:Maxim Integrated Products 功能描述:KIT EVAL INTERFACE CONTROLLER |
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