IR3720MTRPBF International Rectifier, IR3720MTRPBF Datasheet - Page 15

• Manufacturer Part Number: IR3720MTRPBF
• Description: IC POWER SUPPLY MONITOR 10-DFN
• Manufacturer: International Rectifier
• Series: TruePower™r

Specifications of IR3720MTRPBF

• Package / Case: 10-DFN
• Mounting Type: Surface Mount
• Current - Supply: 480µA
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: 0°C ~ 125°C
• Applications: Power Supply Monitor
• Voltage - Input: -
• Input Voltage: 3.3V
• No. Of Outputs: 1
• Supply Voltage Range: 3.135V To 3.465V
• No. Of Pins: 10
• Operating Temperature Range: 0°C To +125°C
• Filter Terminals: SMD
• Input Voltage Primary Max: 3.3V
• Rohs Compliant: Yes
• Frequency: 400kHz
• Package: 10 Lead 3x3 DFN
• Vk Range: 0.5V - 1.8V
• Bias Supply Voltage: +3.3V +/-5%
• Junction Temperature: 0oC to 125oC
• Pbf: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

OUTPUT REGISTER
The output register is loaded with a two’s compliment
factor of voltage, current, or power, depending on the
last request loaded into the configuration register. I
“Direct Data Format” is used. The value of the output
register is to be multiplied by a scale factor that is
derived from equations 1 and 2 above. Maximum
power is the product of maximum voltage and
maximum current.
The range of valid values is indicated in Table 2
below.
Table 2 Output Register Range of Returned
Values
Parameter
FS voltage
Zero voltage
+FS current
-FS current
+FS power
-FS power
A binary point is implicitly located to the left of the first
six least significant figures, as in the example below.
SYYY YYYY YY.00 0000
The “S” above is the twos compliment sign bit, and
the “Y’s” are the twos compliment. Six zeros pad out
the two byte response. These padding zeros could be
considered a factor of the slope, which is allowed by
the Direct Data Format. The output register multiplied
by its scale factor K
engineering units of volts, amps, or watts.
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Returned value
(twos compliment
binary)
0100 0000 0000 0000
0000 0000 0000 0000
0100 0000 0000 0000
1100 0000 0000 0000
0100 0000 0000 0000
1100 0000 0000 0000
x
yields the requested quantity in
www.irf.com
Returned
value
(decimal)
256
0
256
-256
256
-256
2
C
The equations below convert digital counts to
engineering units:
bits (d7, d6) are set to (01).
configuration register bits (d7, d6) are set to (10).
configuration register bits (d7, d6) are set to (00).
There is but one output register, and it holds the
measurement type (voltage, current, or power) last
requested by the configuration register. It is
incumbent upon the user to establish correct
configuration before requesting a read.
READ_VOUT, READ_IOUT, and READ_POUT are
equivalent in that each returns the contents of the
same output register.
BIT#
d15:d0
RESERVED COMMAND
CODES
Command codes D2h through D5h, D7h, and D8h
are reserved for manufacturing use only and could
lead to undesirable device behavior.
Power
Current
Voltage
=
=
=
counts
counts
counts
OUTPUT REGISTER
Output variable, D0 is LSB
⋅
⋅
V
⋅
V
256
FS
V
IG
FS
256
⋅
256
( ⋅
V
R
IG
when configuration register
⋅
CS1
R
( ⋅
⋅
R
T
R
T
⋅
+
CS1
DCR
⋅
R
DCR
CS2
+
R
)
CS2
when
)
when
09/09/08