MA180027 Microchip Technology, MA180027 Datasheet - Page 51

• Manufacturer Part Number: MA180027
• Description: MOD PLUG-IN PIC18F87K90 PICDEM2
• Manufacturer: Microchip Technology
• Series: PIC®r

Specifications of MA180027

• Accessory Type: Plug-In Module (PIM) - PIC18F87K90
• Interface Type: I2C, SPI
• Operating Voltage: 1.8 V to 5.5 V
• Data Bus Width: 8 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18F8xxx
• For Use With/related Products: PICDEM LCD 2 Demonstration Board (DM163030)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM163030 - KIT DEV PICDEM LCD2
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

 2010 Microchip Technology Inc.
As stated previously, R25 = 1K and R26 = 330. You can see that without R102 and
R101, V
For a desired V
R25, solve for R102. Determine the nearest available resistor value for R102 and
recalculate the resulting V
part you will be using.
Table A-23 shows values for R101 and R102 for different V
R25 and R26 on the PICDEM LCD 2 Board are left as their default values of 1K and
330R.
TABLE A-23:
Recommended operating voltages for the various PIMs are:
• PIC18F85J90 and PIC18F87J90 families of devices – 3.3V
• PIC18F8490 family of devices – 5V
• PIC16F917/914 devices – 5V
• PIC16F946 – 5V (when operating on an external 9V DC supply)
• PIC16F1946/7 – 5V
• PIC16LF1946/7 – 3.3V
A.14.2
The slide switch allows choosing the BIAS values, either generated by the resistor
ladder, or by the capacitive charge pump. When S6 is switched to the left, the LCDBIAS
pins of the microcontroller are connected to the resistor ladder. When S6 is switched to
the right, the LCDBIAS pins of the microcontroller are connected to the capacitor
network.
OUT
Slide Switch (S6)
3.6V
3.3V
3.0V
V
= 1.25V(1+ 1K/330R) = 5.04V.
5V
DD
OUT
R101 AND R102 V
, first solve for R2, given R1 = R26 = 330R. Then, knowing R2 and
DD
to make sure it does not exceed the maximum V
Board Technical Information
DD
VALUES
R101
Open
Open
Open
Open
DD
values, assuming that
1.62K
1.18K
R102
Open
866R
DS51662C-page 51
DD
for the