LMV1089RLEVAL National Semiconductor, LMV1089RLEVAL Datasheet - Page 4

• Manufacturer Part Number: LMV1089RLEVAL
• Description: BOARD EVALUATION LMV1089
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMV1089RLEVAL

• Main Purpose: Audio, Microphone Amp
• Embedded: No
• Utilized Ic / Part: LMV1089
• Primary Attributes: Dual Input, Single Output
• Secondary Attributes: Graphical User Interface, I²C Interface
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Power Supply of the LMV1089VY
Demo Board
The LMV1089VY demo board provides three (3) possible
sources for the power supply. The first one is using the ex-
ternal supply via header J12 for V
pin can get its supply from the V
to pin 1 of J22 using a jumper.
The second source of power supply is a small battery placed
in the battery holder mounted on the PCB. For a limited time,
the demo board can be operated from the board battery
(CR1220 placed in the battery holder BT1). To operate the
board using a battery the jumper on J26 should be placed
between pin 2 and pin3, and pin 1 of J21 should be shorted
to pin 1 of J22 using a jumper.
The third source of power is via the I
This is the default configuration of the LMV1090VY demon-
stration board. Using this configuration and a mini USB board
eliminates the need for a separate power supply for evalua-
tion. Supplying the demo board is possible by connecting
jumpers on headers J21 and J22.
Measuring the LMV1089 Supply Current (I
The supply current (I
moboard should not be measured by measuring the current
flowing into CON2 as this includes not only the supply current
(I
currents and I
LMV1089, the jumper on J21 (see Figure 4) should be re-
moved and a DMM in a proper current range should be
DD
) of the part but also will include pull-up and pull-down
2
CV
DD
DD
current. To measure the true I
) of the LMV1089 mounted on the de-
DD
pin by shorting pin 1 of J21
DD
2
C interface header J20.
FIGURE 4. Power Supply Connectors and Headers
and GND. The I
DD
)
DD
2
of the
CV
DD
4
Power Supply of the LMV1089RL
Demoboard
The LMV1089RL demoboard provides three possible sources
for the power supply. One is the external supply via the ba-
nana connectors CON2 and CON3 (see Figure 4), another is
a small battery placed in the battery holder mounted on the
PCB (see Figure 4), the third is via the I
When using an external supply, the LMV1089 demoboard will
receive its power supply via the banana connectors CON2
and CON3. In this mode, the jumper on J26 (see Figure 4) is
placed between pin 2 and pin 3.
For a limited time, the demoboard can also be operated from
an on board battery (CR1220 placed in the battery holder
BT1). To operate the board on the on board battery supply,
the jumper on J26 must be removed from pin 2 and pin 3 and
it must be place placed between pin 1 and pin 2.
It is possible to supply the LMV1089 via the I
header J20 (see Figure 6). Using this configuration and a USB
– I
er supply for evaluation. Supplying the demoboard this way
is possible by connecting pins 1 and 3 of the I
selection header J22 (see Figure 6). This is the default con-
figuration for the LMV1089RL demoboard.
Note: Never have the on board battery and the normal power supply en-
Note: Never connect all three pins (pin 1, pin 2 and pin 3) of J26 together.
mounted instead. In normal operation the supply current of
the LMV1089 will be 1.1mA (typ).
Note: The LMV1089 can for a short time (<200ms) draw up to 50mA supply
Enable Pin
The enable pin must be logic high for operating the on board
LMV1089. This is done by placing a jumper on header J25
(see Figure 4).
2
C convertor board eliminates the need for a separate pow-
abled at the same time.
current during the programming of the EEprom.
2
30060604
C interface.
2
CV
2
C interface
DD
supply