MAX5971B Maxim Integrated Products, MAX5971B Datasheet - Page 13

• Manufacturer Part Number: MAX5971B
• Description: PSE Controller
• Manufacturer: Maxim Integrated Products

16, 18, 20,
22, 24, 28
26, 27
PIN
10
11
12
13
14
15
17
19
21
23
25
—
9
LEGACY
V
NAME
AGND
OUTP
EE_DIG
______________________________________________________________________________________
OSC
N.C.
OUT
SCL
AD0
LED
DET
INT
I.C.
EN
EP
2-Wire Serial Interface Input Clock Line. Referenced to V
not used.
Open-Drain Interrupt Output. Referenced to V
the microcontroller. See the Interrupt section for details. Connect to V
used.
Address Input. Referenced to V
the Device Address section and Table 5 for details. Connect to V
Digital Low-Side Supply Input. Connect to V
Legacy Detection Logic Input. Referenced to V
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.
Enable Input. Referenced to V
nected 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). Bypass
EN to V
Internally Connected. Connect I.C. to V
No Connection. Not internally connected. Leave N.C. unconnected.
LED Indicator Open-Drain Output. Referenced to V
nal LED directly. Blinking functionality is provided to signal different conditions (see the PWM and
LED Signals section). Connect LED to AGND externally (see Figures 15 and 16) or to an external
supply (if available) through a series resistance.
AC-Disconnect Triangular Wave Output. Bypass with a 100nF (Q10% tolerance) external capacitor
to V
function and to activate the DC disconnect function. The OSC state latches after the device is
powered up or after a reset condition.
High-Side Supply Input
Detection/Classification Voltage Output. DET is used to set the detection 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 (see Figure 16).
Port Pullup Output. OUTP is used to pull up the port voltage to AGND when needed. If AC dis-
connect is used, connect OUTP to the anode of the AC-blocking diode. If AC disconnect is not
used, connect OUTP to OUT (see Figures 15 and 17). Bypass OUTP to AGND with a 100V, 0.1FF
ceramic capacitor.
Integrated MOSFET Output. If DC disconnect is used, connect the port output to OUTP (see
Figures 15 and 17). If the AC disconnect function is used, connect OUT to the cathode of the
AC-blocking diode (see Figure 16).
Exposed Pad. Connect EP to V
EE
to enable the AC disconnect function. Connect OSC to V
EE
Single-Port, 40W, IEEE 802.3af/at,
with a 1nF ceramic capacitor.
EE
EE
EE
. EN is internally pulled up to the digital supply. Leave uncon-
. AD0 is used to form the lower part of the device address. See
externally. See the Layout Procedure section for details.
PSE Controller with I
EE
.
FUNCTION
EE
EE
externally.
EE
. INT is pulled low whenever an interrupt is sent to
. LEGACY is internally pulled up to the digital
EE
Pin Description (continued)
. LED can sink 10mA and can drive an exter-
EE
. Connect to V
EE
EE
to disable the AC disconnect
if the I
EE
if the I
EE
2
C interface is not used.
if the I
2
C interface is not
2
C interface is
2
C
13