PCF2119VU/2/F2 Ver la hoja de datos (PDF) - NXP Semiconductors.
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PCF2119VU/2/F2 Datasheet PDF : 79 Pages
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NXP Semiconductors
PCF2119x
LCD controllers/drivers
Table 3. Pin description …continued
Symbol
Pin
Description
R/W
158
read/write input
• pin R/W = HIGH selects the read operation
• pin R/W = LOW selects the write operation
• this pin has an internal pull-up resistor
RS
159
register select pin;
• this pin has an internal pull-up resistor
DB0 to DB2,
DB3/SA0,
DB4 to DB7
160 to 162,
163,
164 to 167
[6][7 8 bit bidirectional data bus (bit 0 to bit 7)
] • the 8-bit bidirectional data bus (3-state) transfers data
between the microcontroller and the PCF2119x
• pin DB7 may be used as the busy flag, signalling that
internal operations are not yet completed
• 4-bit operations the 4 higher order lines DB7 to DB4 are
used, DB3 to DB0 must be left open-circuit
• data bus line DB3 has an alternative function (SA0) as the
I2C-bus address pin
• each data line has its own internal pull-up resistor
OSC
168
oscillator or external clock input
• when the on-chip oscillator is used this pin must be
connected to VDD1
[1] Always put VDD2 = VDD3.
[2] When the I2C-bus is used, the parallel interface pin E must be LOW.
[3] The substrate (rear side of the die) is wired to VSS but should not be electrically connected.
[4] On the device connected to VSS1.
[5] When the parallel bus is used, the pins SCL and SDA must be connected to VSS1 or VDD1; they must not be
left open-circuit.
[6] In the I2C-bus read mode, ports DB7 to DB4 and DB2 to DB0 should be connected to VDD1 or left
open-circuit.
[7] When the 4-bit interface is used without reading out from the PCF2119x (bit R/W is set permanently to
logic 0), the unused ports DB4 to DB0 can either be set to VSS1 or VDD1 instead of leaving them
open-circuit.
PCF2119X_5
Product data sheet
Rev. 05 — 13 August 2009
© NXP B.V. 2009. All rights reserved.
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