LMP91000SDE National Semiconductor, LMP91000SDE Datasheet - Page 19

• Manufacturer Part Number: LMP91000SDE
• Description: AFE, SENSOR, 14LLP
• Manufacturer: National Semiconductor

Specifications of LMP91000SDE

• Brief Features: Programmable Cell Bias Voltage, Low Bias Voltage Drift, I2C Compatible Digital Interface
• Supply Voltage Range: 2.7V To 5.25V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LLP
• Ic Function: Programmable Analogue Front End (AFE)
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application Information
CONNECTION OF MORE THAN ONE LMP91000 TO THE
I
The LMP91000 comes out with a unique and fixed I
address. It is still possible to connect more than one
LMP91000 to an I
MENB pin. The MENB simply enables/disables the I
munication of the LMP91000. When the MENB is at logic level
low all the I
MENB is at high logic level.
In a system based on a μcontroller and more than one
LMP91000 connected to the I
2
C BUS
2
C communication is enabled, it is disabled when
2
C bus and select each device using the
2
C bus, the I
FIGURE 6. 2-Lead Galvanic Cell In Potentiostat Configuration
FIGURE 7. More than one LMP91000 on I
2
C lines (SDA and
2
2
C slave
C com-
19
SCL) are shared, while the MENB of each LMP91000 is con-
nected to a dedicate GPIO port of the μcontroller.
The μcontroller starts communication asserting one out of N
MENB signals where N is the total number of LMP91000s
connected to the I
knowledge the I
with this particular LMP91000, the microcontroller de-asserts
the corresponding MENB and repeats the procedure for other
LMP91000s.
more than one LMP91000 is connected to the I
Figure 7
2
C bus
2
C commands. After finishing communicating
2
C bus. Only the enabled device will ac-
shows the typical connection when
30132581
30132584
2
C bus.
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