ADM1041-EVAL Analog Devices Inc, ADM1041-EVAL Datasheet - Page 33

• Manufacturer Part Number: ADM1041-EVAL
• Description: BOARD EVALUATION ADM1041
• Manufacturer: Analog Devices Inc

Specifications of ADM1041-EVAL

• Main Purpose: AC/DC, Secondary Side
• Outputs And Type: 1, Non-Isolated
• Power - Output: 24W
• Voltage - Output: 12V
• Current - Output: 2A
• Voltage - Input: 85 ~ 132VAC
• Board Type: Fully Populated
• Utilized Ic / Part: ADM1041
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Frequency - Switching: -
• Regulator Topology: -
• Lead Free Status / Rohs Status: Not Compliant

SMBus SERIAL PORT
The programming and microprocessor interface for the
ADM1041 is a standard SMBus serial port, which consists of a
clock line and a data line. The more rigorous requirements of
the SMBus standard are specified in order to give the greatest
noise immunity. The ADM1041 operates in slave mode only. If a
microprocessor is not used, these pins can be configured to
perform the PS
this port is not intended to be connected to the customer’s
SMBus (or I
bus fault interferes with the inter-ASIC communication, possibly
preventing proper operation and proper fault reporting. If the
customer needs status and control functions via the SMBus, it is
recommended that a microprocessor with a hardware SMBus
(I
access the ASICs via a second SMBus port, which may be emu-
lated in software (subset of the full protocol).
SDA/PS
The SDA pin normally carries data in and out of the ASIC
during programming/configuration or while reading/writing by
a microprocessor. If a microprocessor is not used, this pin can
be configured as PS
pin on other ADM1041s in the power supply. If a fault is
detected in any ADM1041, causing it to shut down, it uses this
pin to signal the other ADM1041s to also shut down. If an auto-
restart has been configured, it also causes all ADM1041s to turn
on together.
SCL/AC_OKLink
The SCL pin normally provides a clock signal into the ASIC
during programming/configuration or while reading/writing by
a microprocessor. If a microprocessor is not used, this pin can
be configured as AC_OKLink, and can be connected to the
same pin on other ADM1041s in the power supply. This allows
a single ADM1041 to be used for ac sensing and helps to
synchronize the start-up of multiple ADM1041s.
ADD0
This pin configures two bits of the chip address for the SMBus.
It is three-level and can be pulled high to V
ground, or left floating (internally biased to 2.5 V). An additional
bit may be set during configuration, which allows up to six
ADM1041s to be used in a single power supply. The state of
ADD0 is continuously sampled after V
first time the ADM1041 is successfully addressed, the internal
bias is released and ADD0 becomes high impedance.
2
C) port be used for this interface. The microprocessor should
ON
LINK
2
C bus). Continuous SMBus activity or an external
ON
LINK and AC_OKLink functions. Note that
ON
LINK and can be connected to the same
DD
power-up. After the
DD
, pulled low to
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MICROPROCESSOR SUPPORT
The ADM1041 has many features that allow it to operate with
the aid of a microprocessor. There are several reasons why a
microprocessor might be used:
•
•
•
•
•
•
Interfacing
The microprocessor must access the ADM1041(s) via their
on-board SMBus (I
configuration of the ADM1041(s), the software must include a
routine that avoids SMBus activity during the configuration
process. The simplest interface is for the microprocessor to have
an SMBus (I
more expensive. An alternative is to emulate the bus in software
and to use two general-purpose logic I/O pins. Only a simple
subset of the SMBus protocol need be emulated because the
ADM1041 always operates as a slave device.
Configuring for a Microprocessor
Except during initial configuration, all ADM1041 registers that
need to be accessed are high speed CMOS devices that do not
involve EEPROM. The Microprocessor Support table (Table 43)
details the various registers, bits, and flags that can be read and
written to, including explanations.
Note that for the microprocessor to gain control of the PSON
and AC
must be configured to be broken. A separate configuration bit is
allocated to each signal. The microprocessor can then write to
the signal after the break as though the signal originated within
the ADM1041 itself. The original signals can still be read prior
to the break.
To provide unusual logic and/or timing requirements,
particularly for fault conditions.
To drive one or more LEDs, including flashing, according
to the status of the power supply.
To replace other discrete circuits such as multiple OTP,
extra output monitoring, fan speed control, and failure
detection, and combine the status of these circuits with the
status of the ADM1041s.
To free up some pins on the ADM1041s. This could reduce
the number of ASICs and therefore the cost.
To interface to an external SMBus (or I
detailed status reporting. The SMBus port in the ADM1041
is not intended for this purpose.
To allow EEPROM space in ADM1041(s) or in the
microprocessor to be used for FRU (VPD) data. A simple
or complex microprocessor can be used according to the
amount of additional functionality required. Note that the
microprocessor is not intended to access or modify the
EEPROM address space that is used for the configuration
of the ADM1041(s).
SENSE
functions, the normal signal path in the ADM1041
2
C) port implemented in hardware, but this may be
2
C) port. Since this port is also used for
2
C) for more
ADM1041