IR3725MPBF International Rectifier, IR3725MPBF Datasheet - Page 13

• Manufacturer Part Number: IR3725MPBF
• Description: Input Power Monitor IC with Digital Interface
• Manufacturer: International Rectifier

Specifications of IR3725MPBF

• Package: 12 Lead DFN
• Bias Supply Voltage: +3.3V +/-5%
• Junction Temperature: 0oC to 125oC
• Pbf: Yes

CONFIGURATION REGISTER
A configuration register is maintained via the serial
bus MFR_SPECIFIC_00 command, code # D0h. The
low order nibble (d3, d2, d1, d0) contains a binary
number N from zero to eight. The averaging interval
is 2
The next bit (d4) is to be used as a function shutdown
bit. b’1 commands an energy saving shutdown mode,
and power on default b’0 commands fully functioning
mode.
d5 high enables the EXTCLK pin to receive the
external clock signal, and default d5 low enables the
internal clock.
The next two bits (d7, d6) program the output
parameter. B’00 causes power to be measured and is
the power on default state. B’01 causes voltage to be
measured. B’10 causes current to be measured. B’11
is not defined and should not be used.
The next bit (d8) is used to configure the ALERT#
pin. b’0 is the power on default, and commands
ALERT# to be pulled low when new data is available.
b’1 programs the ALERT# to pull low when the
programmable threshold level is exceeded, whether it
is power, voltage, or current.
Register bits (d15...d9) are the ALERT# threshold
register. If the output register is larger than this
register, and if (d8) is b’1, then the ALERT# pin will
pull low. The two least significant bits of the output
register are not represented in the ALERT# threshold
register. d15…d9 defaults to zero on start up.
Page 13 of 19
N
milliseconds. N defaults to zero on start up.
www.irf.com
The results of a configuration register change will be
reflected in the OUTPUT REGISTER after previously
requested operations have completed. Initialize the
configuration register after start up.
BIT #
d0
d1
d2
d3
d4
d5
d6
d7
d8
d9
d10
d11
d12
d13
d14
d15
CONFIGURATION REGISTER
Averaging interval (LSB)
Averaging interval
Averaging interval
Averaging interval (MSB)
Shutdown
External clock
OUTPUT config (LSB)
OUTPUT config (MSB)
ALERT# configuration
ALERT# threshold (LSB + 2)
ALERT# threshold
ALERT# threshold
ALERT# threshold
ALERT# threshold
ALERT# threshold
ALERT# threshold (MSB)
IR3725
Data Sheet
2011_11_16