Rainbow Electronics MAX5965B - Manual (Page 14)

MAX5965A/MAX5965B
High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
14 ______________________________________________________________________________________
Functional Diagram
50 μA
90 μA 100mA
MAX FAST
DISCHARGE
CONTROL
212mV 182mV
13V CLAMP
CURRENT-LIMIT
DETECTOR
4mV
OVERCURRENT
(OVC)
OPEN CIRCUIT
(OC)
CURRENT
LIMIT (ILIM)
PWR_EN
10V
VOLTAGE
SENSING
FOLDBACK
CONTROL
9-BIT ADC
CONVERTER
VOLTAGE PROBING
AND
CURRENT-LIMIT
CONTROL
CURRENT SENSING
SENSE_
GATE_
OUT_
DET_
A = 3
AC
DETECTION*
ACD_ENABLE
AC DISCONNECT
SIGNAL
(ACD)
ACD
REFERENCE
CURRENT
DETECTION/
CLASSIFICATION
SM
PORT
STATE
MACHINE
(SM)
REGISTER FILE
THREE-WIRE
SERIAL
PORT
INTERFACE
AUTO
MIDSPAN
A0
A1
A2
A3
ANALOG
BIAS/
SUPPLY
MONITOR
AGND
*AC DETECTION ONLY FOR THE MAX5965B.
V EE
V DD
DGND
+10V ANALOG
+5V DIG
VOLTAGE
REFERENCES
CURRENT
REFERENCES
CENTRAL LOGIC UNIT
(CLU)
DGND OSC_IN SCL SDAIN SDAOUT V DD
OSCILLATOR
MONITOR
SHD_
RESET
INT
MAX5965A/MAX5965B
9-BIT
ADC
REGISTER
FILE
CURRENT
MEASUREMENT