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参数资料
| 型号： | MAX5980GTJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 16/49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
Semiautomatic (Semi) Mode
Enter semiautomatic mode by setting the port operating
mode (R12h, Table 19) to [10]. When entering semi mode,
the DET_EN_ and CLASS_EN_ bits retain their previous
states. When the DET_EN_ and/or CLASS_EN_ bits are set
to 1, the MAX5980 performs detection and/or classification
repeatedly, but do not power up the port(s) automatically.
Setting R19h[3:0] (PWR_ON_, Table 26) high turns on
power to the port(s) if detection and classification has
successfully completed. If a port is powered down while
in semiautomatic mode, the corresponding DET_EN_
and CLASS_EN_ bits are reset to 0.
Manual Mode
Enter manual mode by setting the port operating mode
(R12h, Table 19) to [01]. Manual mode allows the soft-
ware to dictate any sequence of operation. In manual
mode, the Detection/Classification register (R14h, Table
22) is set to 00h, and DET_EN_/CLASS_EN_ become
pushbutton bits. A port will only perform a single detec-
tion/classification cycle when DET_EN_/CLASS_EN_ are
set high, and they are reset low after execution.
PWR_ON_ (R19h[3:0], Table 26) has the highest prior-
ity, and setting PWR_ON_ high at any time causes the
device to immediately enter the powered mode. Setting
DET_EN_ and CLASS_EN_ high at the same time causes
detection to be performed first. Once in the powered
state, the device ignores DET_EN_ and CLASS_EN_
commands.
Shutdown Mode
To put a port into shutdown mode, set the correspond-
ing port mode bits (R12h, Table 19) to [00]. Putting
a port into shutdown mode immediately turns off port
power, clears the event and status bits, and halts all port
operations. In shutdown mode the serial interface is still
fully active; however, all DET_EN_, CLASS_EN_, and
PWR_ON_ commands are ignored.
PD Detection
During normal operation, the device probes the output
for a valid PD. A valid PD has a 25k I discovery signature
characteristic as specified in the IEEE 802.3at/af stan-
dard. Table 1 shows the IEEE 802.3at specification for a
PSE detecting a valid PD signature.
After each detection cycle, the device sets DET_
(R04h[3:0] and R05h[3:0], Table 9) to 1 and reports
the detection results in the detection status bits (see
Table 13). The DET_ bits are reset to 0 when read
through the CoR (clear on read) register (R05h), or after
a reset event.
During detection, the device keeps the external MOSFET
off and forces two probe voltages through OUT_. The
current through OUT_ is measured, as well as the volt-
age difference from AGND to OUT_. A two-point slope
measurement is used, as specified by the IEEE 802.3at/
af standard, to verify the device connected to the port.
The device implements appropriate settling times to
reject 50Hz/60Hz power-line noise coupling.
Table 1. PSE PI Detection Modes Electrical Requirements (IEEE 802.3at)
PARAMETER
Open-Circuit Voltage
Short-Circuit Current
Valid Test Voltage
Voltage Difference Between Test
Points
Time Between Any Two Test Points
Slew Rate
Accept Signature Resistance
Reject Signature Resistance
Open-Circuit Resistance
Accept Signature Capacitance
Reject Signature Capacitance
Signature Offset Voltage Tolerance
Signature Offset Current Tolerance
SYMBOL
V OC
I SC
V VALID
D V TEST
t BP
V SLEW
R GOOD
R BAD
R OPEN
C GOOD
C BAD
V OS
I OS
MIN
—
—
2.8
1
2
—
19
< 15
500
—
10
0
0
MAX
30
5
10
—
—
0.1
26.5
> 33
—
150
—
2.0
12
UNITS
V
mA
V
V
ms
V/ F s
k I
k I
k I
nF
F F
V
F A
ADDITIONAL INFORMATION
In detection mode only
In detection mode only
—
—
This timing implies a 500Hz
maximum probing frequency
—
—
—
—
—
—
—
—
16
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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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