PCF2119X Datasheet, PDF (8/79 Pages) NXP Semiconductors – LCD controllers/drivers

NXP Semiconductors
PCF2119x
LCD controllers/drivers
Table 4. State after reset
Step Function
Control bit and
register state
Description
1 Clear_display
2 Entry_mode_set
bit I_D = 1
incremental cursor move direction
bit S = 0
no display shift
3 Display_ctl
bit D = 0
display off
bit C = 0
cursor off
bit B = 0
cursor character blink off
4 Function_set
bit DL = 1
8-bit interface
bit M = 0
1-line display
bit SL = 0
1:18 multiplex drive mode
bit H = 0
normal instruction set
5 default address pointer to DDRAM ^[1]
6 Icon_ctl
bit IM = 0
character mode, full display
bit IB = 0
icon blink disabled
7 Screen_conf
bit L = 0
default configuration
Disp_conf
bit P = 0; bit Q = 0
default configurations
8 Temp_ctl
bit TC1 = 0; bit TC2 = 0 default temperature coefficient
9 VLCD_set
10 I²C-bus interface reset
register V_A = 0;
register V_B = 0
V_LCD generator off
11 HV_gen
bit S1 = 1; bit S0 = 0
V_LCD generator set to 3 internal stages
(4 voltage multipliers)
Reference
Table 16
Table 18
Table 19
Table 12
Table 22
Table 25
Table 23
Table 24
Table 28
Table 32
Table 30
[1] The Busy Flag (BF) indicates the busy state (bit BF = 1) until initialization ends. The busy state lasts 2 ms. The chip may also be
initialized by software (see Table 43 and Table 44).
8.3 Power-down mode
The chip can be put into power-down mode by applying a HIGH-level to pin PD. In
power-down mode all static currents are switched off (no internal oscillator, no bias level
generation and all LCD outputs are internally connected to V_SS).
During power-down, information in the RAMs and the chip state are preserved. Instruction
execution during power-down is possible when pin OSC is externally clocked.
8.4 LCD supply voltage generator
The LCD supply voltage may be generated on-chip. The V_LCD generator is controlled by
two internal 6-bit registers: V_A and V_B. Register V_A is programmed with the voltage for
character mode and register V_B with the voltage for icon mode.
The nominal LCD operating voltage at room temperature is given by Equation 2:
V _LCD(nom) = V _x × 0.08 + 1.82
(2)
PCF2119X_5
Product data sheet
Where V_x is the integer value of the register V_A or V_B.
It should be noted that V_LCD is sometimes referred as the LCD operating voltage (V_oper).
Rev. 05 — 13 August 2009
© NXP B.V. 2009. All rights reserved.
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