參數(shù)資料
型號(hào)： MAX5984DETI+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 4/22頁(yè)
文件大?。?/td> 0K
描述： IC CTRLR PD IEEE W/MOSFT 28TQFN
標(biāo)準(zhǔn)包裝： 2,500
系列： *
12 _____________________________________________________________________________________
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Pin Description (continued)
PIN
NAME
FUNCTION
7
MIDSPAN
Detection Collision Avoidance Logic Input. Referenced to VEE. MIDSPAN is internally pulled up
to the digital supply. Leave unconnected to activate the detection collision avoidance circuitry
for midspan PSE systems. Force low to disable this function for an end-point PSE system. The
MIDSPAN logic level latches after the device is powered up or after a reset condition.
8–11, 15
I.C.
Internally Connected. Connect I.C. to VEE.
12
VEE_DIG
Digital Low-Side Supply Input. Connect to VEE externally.
13
LEGACY
Legacy Detection Logic Input. Referenced to VEE. LEGACY is internally pulled up to the digital
supply. Leave unconnected to activate the legacy PD detection. Force low to disable this function.
The LEGACY logic level latches after the device is powered up or after a reset condition.
14
EN
Enable Input. Referenced to VEE. EN is internally pulled up to the digital supply. Leave
unconnected to enable the device. Force low for at least 40Fs to reset the device. The MIDSPAN,
OSC, and LEGACY states latch-in when the reset condition is removed (low-to-high transition).
16, 18,
20, 22,
24, 28
N.C.
No Connection. Not internally connected. Leave N.C. unconnected.
17
LED
LED Indicator Open-Drain Output. Referenced to VEE. LED can sink 10mA and can drive an
external LED directly. Blinking functionality is provided to signal different conditions (see the PWM
and LED Signals section). Connect LED to AGND externally or to an external supply (if available)
through a series resistance (Figures 6 and 7).
19
OSC
AC Disconnect Triangular Wave Output. Bypass with a 100nF (Q10% tolerance) external capacitor
to VEE to enable the AC disconnect function. Connect OSC to VEE to disable the AC disconnect
function and to activate the DC disconnect function. The OSC state latches after the device is
powered up or after a reset condition.
21
AGND
High-Side Supply Input
23
DET
Detection/Classification Voltage Output. DET is used to set the detection mark event and
classification probe voltages and for the AC current sensing when using the AC disconnect
function. To use the AC disconnect function, place a 1kI and 0.47FF RC series in parallel with the
external protection diode to OUTP (Figure 7).
25
OUTP
Port Pullup Output. OUTP is used to pull up the port voltage to AGND when needed. If AC
disconnect is used, connect OUTP to the anode of the AC-blocking diode. If AC disconnect is
not used, connect OUTP to OUT (Figures 6 and 8). Bypass OUTP to AGND with a 100V, 0.1FF
ceramic capacitor.
26, 27
OUT
Integrated MOSFET Output. If DC disconnect is used, connect the port output to OUTP (Figures
6 and 8). If the AC disconnect function is used, connect OUT to the cathode of the AC-blocking
diode (Figure 7).
—
EP
Exposed Pad. Connect EP to VEE externally. See the Layout Procedure section for details.
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