MAX5935CAX Maxim Integrated Products, MAX5935CAX Datasheet - Page 18

• Manufacturer Part Number: MAX5935CAX
• Description: Hot Swap & Power Distribution
• Manufacturer: Maxim Integrated Products

Specifications of MAX5935CAX

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX5935 also features three other undervoltage
and overvoltage interrupts: V
(V
overvoltage interrupt (V
supply events register (Table 11), but the MAX5935
does not shut down the ports with a V
V
Setting R13h[DCD_EN_] bits high enables DC load
monitoring during normal powered state. If SENSE_
falls below the DC load disconnect threshold, V
for more than t
asserts the LD_DISC_ bit of the corresponding port.
t
The MAX5935 features AC load disconnect monitoring.
Connect an external sine wave to OSC_IN. The oscilla-
tor requirements are:
•
•
•
•
The MAX5935 buffers and amplifies 3x the external
oscillator signal and sends the signal to DET_, where
the sine wave is AC-coupled to the output. The
MAX5935 senses the presence of the load by monitor-
ing the amplitude of the AC current returned to DET_
(see the Functional Diagram).
Setting R13h[ACD_EN_] bits high enable AC load dis-
connect monitoring during the normal powered state. If
the AC current peak at the DET_ pin falls below I
for more than t
asserts the LD_DISC_ bit of the corresponding port.
I
An internal comparator checks for a proper amplitude
of the oscillator input. If the positive peak of the input
sinusoid falls below a safety value of 2V, OSC_FAIL
sets and the port shuts down. Power cannot be applied
to the ports when ACD_EN is set high and OSC_FAIL is
set high. Leave OSC_IN unconnected or connect it to
DGND when not using AC disconnect detection.
When using the AC disconnect detection feature, con-
nect AGND directly to DNGD as close as possible to
the IC. The MAX5935 also requires a V
than +3V for this function. See the Typical Application
Circuit with AC disconnect for other external compo-
nent requirements.
Quad Network Power Controller
for Power-Over-LAN
18
DISC
ACTH
DDOV
EEUV
Frequency x V
Positive peak voltage > +2V
Frequency > 60Hz
A 100Hz ±10%, 2V
(V
______________________________________________________________________________________
is programmable using R16h[0-1] and R27h[0-3].
PEAK
is programmable using R23h[0-3].
.
), V
DD
= +2.2V, typ) is recommended.
undervoltage interrupt (V
DISC
DISC
P-P
, the device turns off power and
, the device turns off power and
= 200V
DC Disconnect Monitoring
AC Disconnect Monitoring
DDOV
P-P
P-P
EE
). A fault latches into the
±5%, with +1.2V offset
x Hz ±15%
undervoltage interrupt
EEUV
DDUV
DD
, V
), and V
of greater
DDUV
DCTH
ACTH
, or
DD
,
If the MAX5935 die temperature reaches +150°C, an
overtemperature fault generates and the MAX5935
shuts down and the MOSFETs turn off. The die temper-
ature of the MAX5935 must cool down below +130°C to
remove the overtemperature fault condition. After a
thermal shutdown, the part is reset.
A3, A2, A1, and A0 represent the four LSBs of the chip
address, the complete seven bits chip address (see
Table 3).
The four LSBs latch on the low-to-high transition of
RESET or after a power-supply start (either on V
V
50kΩ pullup resistor to V
responds to the call through a global address 60h (see
the Global Addressing and Alert Response Protocol
section).
The MAX5935 operates as a slave that sends and
receives data through an I
wire interface. The interface uses a serial data input line
(SDAIN), a serial data output line (SDAOUT) and a seri-
al clock line (SCL) to achieve bidirectional communica-
tion between master(s) and slave(s). A master (typically
a microcontroller) initiates all data transfers to and from
the MAX5935, and generates the SCL clock that syn-
chronizes the data transfer. In most applications, con-
nect the SDAIN and the SDAOUT lines together to form
the serial data line (SDA).
Using the separate input and output data lines allows
optocoupling with the controller bus when an isolated
supply powers the microcontroller.
The MAX5935 SDAIN line operates as input. The
MAX5935 SDAOUT operates as an open-drain output.
A pullup resistor, typically 4.7kΩ, is required on
SDAOUT. The MAX5935 SCL line operates only as an
input. A pullup resistor, typically 4.7kΩ, is required on
SCL if there are multiple masters, or if the master in a
single-master system has an open-drain SCL output.
Each transmission consists of a START condition (Figure
7) sent by a master, followed by the MAX5935 7-bit slave
address plus R/W bit, a register address byte, one or
more data bytes, and finally a STOP condition.
Table 3. MAX5935 Address
EE
0
). Address inputs default high through an internal
1
I
0
2
C-Compatible Serial Interface
A3
2
C-compatible, 2-wire or 3-
DD
A2
Thermal Shutdown
. The MAX5935 also
Address Inputs
Serial Addressing
A1
A0
DD
R/W
or