DS3508 Maxim Integrated Products, DS3508 Datasheet

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DS3508

Manufacturer Part Number
DS3508
Description
Manufacturer
Maxim Integrated Products
Datasheet
The DS3508 is a programmable 8-channel gamma volt-
age generator with one byte of on-chip EEPROM and
one byte of SRAM memory per channel. Each channel
is composed of an independent 8-bit DAC with an asso-
ciated EEPROM/SRAM pair. At power-up, nonvolatile
(NV) EEPROM gamma data is loaded into its corre-
sponding SRAM register that drives the associated 8-bit
DAC. An on-chip control register allows selectable con-
trol of writing to SRAM/EEPROM or SRAM only.
The DS3508 is designed for low-power operation and
draws less than 2mA (typ) from the V
Programming occurs through an I
interface with support for speeds up to 400kHz.
Rev 0; 1/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MASTER
I
2
C
TFT-LCD Gamma Buffer
Industrial Controls
5.0V
I
2
C, 8-Channel Gamma Buffer with EEPROM
Typical Operating Circuit
V
SDA
SCL
A0
GND
CC
________________________________________________________________ Maxim Integrated Products
15.0V
V
DD
DS3508
General Description
14.8V
VHH
0.2V
VLL
VHM
VLM
8.0V
7.0V
GM1
GM2
GM3
GM4
GM5
GM6
GM7
GM8
2
Applications
C-compatible serial
8
DD
LIQUID-CRYSTAL
SOURCE DRIVER
DISPLAY
supply.
♦ 8-Bit Gamma DACs, 8 Channels
♦ 1 Byte EEPROM and 1 Byte SRAM per Channel
♦ Ultra-Low Power (2mA I
♦ 400kbps I
♦ 9.0V to 15.5V Analog Supply
♦ 2.7V to 5.5V Digital Supply
♦ 20-Pin TSSOP Package
♦ Address Pin Allows Two DS3508s to Reside on
+ Denotes a lead-free package.
T&R = Tape and reel.
DS3508E+
DS3508E+T&R
the Same I
PART
VHM
GND
VHH
VLM
SDA
N.C.
SCL
V
VLL
2
TOP VIEW
A0
DD
C Interface
2
C Bus
10
1
2
3
4
5
6
7
8
9
-45°C to +95°C
-45°C to +95°C
TEMP RANGE
Ordering Information
DS3508
TSSOP
DD
Pin Configuration
, typ)
20
19
18
17
16
15
14
13
12
11
PIN-PACKAGE
20 TSSOP
20 TSSOP
V
GM1
GM2
GM3
GM4
GM5
GM6
GM7
GM8
N.C.
Features
CC
1

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DS3508 Summary of contents

Page 1

... Byte EEPROM and 1 Byte SRAM per Channel ♦ Ultra-Low Power (2mA I ♦ 400kbps I ♦ 9.0V to 15.5V Analog Supply ♦ 2.7V to 5.5V Digital Supply ♦ 20-Pin TSSOP Package supply. DD ♦ Address Pin Allows Two DS3508s to Reside on C-compatible serial the Same I Applications PART DS3508E+ DS3508E+T&R + Denotes a lead-free package. ...

Page 2

I C, 8-Channel Gamma Buffer with EEPROM ABSOLUTE MAXIMUM RATINGS Voltage Range on V and DD VHH Relative to GND ..........................................-0.5V to +16V Voltage Range on VHM, VLM, and VLL Relative to GND............................................-0.5V to +12V Voltage Range on V ...

Page 3

I C, 8-Channel Gamma Buffer with EEPROM OUTPUT ELECTRICAL CHARACTERISTICS (V = +2.7V to +5.5V 15.5V PARAMETER SYMBOL Gamma DAC Resolution Integral Nonlinearity Error Differential Nonlinearity Error Output Voltage Range: GM1–GM4 Output Voltage ...

Page 4

I C, 8-Channel Gamma Buffer with EEPROM ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.5V -45°C to +95°C, timing referenced PARAMETER SYMBOL SDA Output Low Voltage Input Capacitance on A0, ...

Page 5

I C, 8-Channel Gamma Buffer with EEPROM (V = 15.0V 5.0V +25°C, unless otherwise noted ANALOG SUPPLY CURRENT vs. TEMPERATURE 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -45 -25 -5 ...

Page 6

... SRAM 1 DAC EEPROM 1 8-BIT SRAM 2 DAC EEPROM 2 8-BIT SRAM 3 DAC EEPROM 3 8-BIT SRAM 4 DAC EEPROM 4 8-BIT SRAM 5 DAC EEPROM 5 8-BIT SRAM 6 DAC EEPROM 6 8-BIT SRAM 7 DAC EEPROM 7 8-BIT SRAM 8 DAC EEPROM 8 DS3508 GM1 GM2 GM3 GM4 GM5 GM6 GM7 GM8 ...

Page 7

... V Power CC Detailed Description The DS3508 provides eight independent DACs that allow precise and repeatable setting of gamma curves. The DS3508 provides four high-voltage DACs (GM1–GM4) that operate between VHH and VHM and four low-voltage DACs (GM5–GM8) that operate between VLM and VLL. Each of the DACs provides 8 bits of resolution ...

Page 8

I C, 8-Channel Gamma Buffer with EEPROM On power-up, the gamma data that is stored in each channel’s EEPROM register is loaded into the corre- sponding SRAM registers. The volatile CR register pow- ers up as 00h, setting the ...

Page 9

... VHH + 253 x (VHM - VHH)/255 VHH + 254 x (VHM - VHH)/255 VHM The slave address byte consists of a 7-bit slave LSB address plus a R/W bit (see Figure 3). The DS3508’s slave address is determined by the state of the A0 pin. A0 R/W This pin allows up to two devices to reside on the same ...

Page 10

... I C, 8-Channel Gamma Buffer with EEPROM Memory Organization Memory Description The list of registers/memory contained in the DS3508 is shown in the memory map (Table 2). Each of the GMx Table 2. Memory Map NAME GM1 GM2 GM3 GM4 GM5 GM6 GM7 GM8 Control Register Reserved *All EEPROM1–8 is factory-programmed to 80h. ...

Page 11

I C, 8-Channel Gamma Buffer with EEPROM Serial Interface Description The following terminology is commonly used to describe data transfers. (See Figure 4 and the I Characteristics table for additional information.) Master device: ...

Page 12

... START condition, writes the slave address byte (R/W = 0), writes the starting memory address, writes data bytes, and generates a STOP condition. The DS3508 can write bytes (1 page or row single write transaction. This is internally controlled by an address counter that allows data to be written to consecutive addresses without transmitting a memory address before each data byte is sent ...

Page 13

... STOP condition. The master must NACK the last byte to inform the slave that no additional bytes are to be read. Applications Information Power-Supply Decoupling To achieve the best results when using the DS3508, decouple both power-supply pins (V 0.01µF or 0.1µF capacitor. Use a high-quality ceramic surface-mount capacitor if possible. Surface-mount Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product ...

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