NT7502
65 X 132 RAM-Map LCD Controller / Driver
Features
! Direct RAM data display using the display RAM. When
RAM data bit is 0, it is not displayed. When RAM data bit is 1, it is displayed. (At normal display) ! RAM capacity: 65 X 132 = 8580 bits ! Many command functions: Read/Write Display Data. Display ON/OFF. Normal/Reverse Display. Page Address Set. Set Display Start Line. Set LCD Bias, Electronic contrast Controls, V0 voltage regulation internal resistor ratio set, Read Modify Write, Select Segment Driver Direction, Power Save
! High-speed 8-bit microprocessor interface allowing direct
connection to both the 8080 and 6800 ! Serial interface ! Power supply voltage: 2.4 - 3.5V ! Maximum 12V LCD driving output voltage ! 2X / 3X / 4X on chip DC-DC converter ! Voltage regulator ! Voltage follower ! On-chip oscillator
General Description
辟谷丹The NT7502 is a single-chip LCD driver for dot-matrix liquid crystal displays which is directly connectable to a microcomputer bus. It accepts 8-bit serial or parallel display data directly sent from a microcomputer and stores it in an on-chip display RAM. It generates a LCD drive signal independent of the microprocessor clock.
The set of the on-chip display RAM of 65 X 132 bits and a one-to-one correspondence between LCD panel pixel dots and on-chip RAM bits permit implementation of displays with a high degree of freedom.
The NT7502 contains 65 common output circuits and 132 segment output circuits, so that a single chip of NT7502 can make 65 X 132, 55 X 132, 49 X 132 and 33 X 132 dot displays with pad option (DUTY1, DUTY0).
No external operation clock is required for RAM read/write operations. Accordingly, this driver can be operated with a minimum current consumption and its onboard low-current-consumption liquid crystal power supply can implement a high-performance handy display system with minimum current consumption and the smallest LSI configuration.
Pin Configuration
V4CS1CS2RES A0WR RD D0D1D2D3D4D5D6D7DUTY 0D UTY 1VDD VDD2VSS VOUT NC CAP3+C AP1-CAP2+C AP2-VEXT VRS V1V2V3NC
V0VR M/S CLS C86P/S HPM NC NC NC NC FR CL DOF NC IRS CAP1+
NT7502 Pad Configuration
NT7502
Block Diagram
(E)
WR
)
W
/
R((SI)(SCL)
NT7502
废塑料炼油Pad Description
Power Supply
NT7502
便携式鱼缸
LCD Driver Supplies
Pad No. Symbol I/O Descriptions
45 - 46 CAP1- O Capacitor 1- pad for internal DC/DC voltage converter 47 - 48 CAP1+ O Capacitor 1+ pad for internal DC/DC voltage converter 51 - 52 CAP2- O Capacitor 2- pad for internal DC/DC voltage converter 49 - 50 CAP2+ O Capacitor 2+ pad for internal DC/DC voltage converter 43 - 44 CAP3+ O Capacitor 3+ pad for internal DC/DC voltage converter 41 - 42 V OUT
O
DC/DC voltage converter output
67 - 68
csmateV R I
Voltage adjustment pad. Applies voltage between V 0 and V SS using a
resistive divider
穿心电容
54 V EXT I
This is the external input reference voltage (V REF ) for the internal voltage regulator. It is valid only when external V REF is used.电伴热带温控 V EXT must be ≥ 2.4V and ≤ V DD2
When using internal V REF , this pad must be NC 82 TMPS I Selects temperature coefficient of the reference voltage
TMPS = 0: -0.05% / °C
TMPS = 1: -0.2 % / °C
55 VRS I Select the internal voltage regulator or external voltage regulator,
VRS = 0: using the external V REF
VRS = 1: using the internal V REF
NT7502 System Bus Connection Pads
