PIC16LF1939-E/P Microchip Technology, PIC16LF1939-E/P Datasheet - Page 335

• Manufacturer Part Number: PIC16LF1939-E/P
• Description: 28KB Flash, 1KB RAM, 256B EEPROM, LCD, NanoWatt XLP 40 PDIP .600in TUBE
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16LF1939-E/P

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 28KB (16K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

26.3
The LCD module can be configured for one of three
bias types:
• Static Bias (2 voltage levels: V
• 1/2 Bias (3 voltage levels: V
• 1/3 Bias (4 voltage levels: V
FIGURE 26-3:
 2009 Microchip Technology Inc.
V
2/3 V
VLCD3
VLCD2
VLCD1
LCD
)
LCD
1.024V from
FVR
LCD Bias Voltage Generation
and V
VLCD3PE
VLCD2PE
LCD
VLCD1PE
)
x 3
LCD BIAS VOLTAGE GENERATION BLOCK DIAGRAM
V
DD
SS
SS
3.072V
SS
, 1/2 V
, 1/3 V
and V
LCD
LCD
LCD
,
and
)
Preliminary
LCDCST<2:0>
TABLE 26-2:
So that the user is not forced to place external compo-
nents and use up to three pins for bias voltage generation,
internal contrast control and an internal reference ladder
are provided internally to the PIC16F193X/LF193X. Both
of these features may be used in conjunction with the
external VLCD<3:1> pins, to provide maximum flexibility.
Refer to Figure 26-3.
PIC16F193X/LF193X
LCD Bias 0
LCD Bias 1
LCD Bias 2
LCD Bias 3
LCDIRE
LCDA
LCDIRS
LCDA
LCDIRE
LCDIRS
Static Bias
V
LCD BIAS VOLTAGES
V
LCD
—
—
SS
3
LCDA
BIASMD
1/2 Bias
1/2 V
1/2 V
V
V
LCD
SS
LCDRLP0
LCDRLP1
DS41364D-page 335
DD
DD
3
lcdbias3
lcdbias2
lcdbias0
lcdbias1
1/3 Bias
1/3 V
2/3 V
V
V
LCD
SS
DD
DD
3