Datasheet

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This is information on a product in full production.

June 2013 DocID13236 Rev 9 1/28

STVM100

C LCD/e-paper VCOM calibrator

Datasheet - production data

Features

• I

C interface, slave address: 1001111

• 7-bit adjustable sink current output

• 2.25 V to 3.6 V logic supply voltage V

• AV

operating voltages

– 4.5 V to 20 V for V

from 2.6 V to 3.6 V

– 4.5 V to 13 V for V

from 2.25 V to 3.6 V

• EEPROM for storing the optimum V

COM

setting

• Guaranteed monotonic output over operating

range

• 400 kHz maximum interface bus speed

• Operating temperature: –40 °C to 85 °C

• Available in an 8-pin 3 mm x 3 mm TDFN8 or

3 mm x 3 mm TSSOP8 package

Applications

• TFT-LCD panels

• e-paper and e-book displays

Description

The STVM100 is a programmable VCOM

adjustment solution for thin-film transistor (TFT)

liquid-crystal displays (LCDs) to remove “flickers”.

It is also used in e-paper and e-book applications

to avoid the “ghosting” effect (residual pixels after

display refresh). It can replace a mechanical

potentiometer, so that the factory operator can

physically view the front screen when performing

the VCOM adjustment. This significantly reduces

labor costs, increases reliability, and enables

automation.

The STVM100 provides a digital I

C interface to

control the sink current output (I

OUT

). This output

drives an external resistive voltage divider, which

can then be applied to an external V

COM

buffer.

Three external resistors R

, R

, and R

SET

determine the highest and lowest value of the

COM

. An increase in the output sink current will

lower the voltage on the external divider so that

the V

COM

can be adjusted by 128 steps within this

range. Once the desired V

COM

setting is

achieved, it can be stored in the internal

EEPROM that will be automatically recalled

during each power-up.

The STVM100 is available in an 8-pin, 3 mm x

3 mm TDFN8 or 3 mm x 3 mm TSSOP8 package.

TDFN8 (3 mm x 3 mm) (DC)

TSSOP8 (3 mm x 3 mm) (DS)

Table 1. Device summary

Order code Optimum temperature range Package Packing

STVM100DC6F –40 °C to 85 °C TDFN8 ECOPACK

package, tape and reel

STVM100DS6F –40 °C to 85 °C TSSOP8 ECOPACK

package, tape and reel

www.st.com

Summary of content (27 pages)

PAGE 1
STVM100 I2C LCD/e-paper VCOM calibrator Datasheet - production data Applications • TFT-LCD panels • e-paper and e-book displays TDFN8 (3 mm x 3 mm) (DC) Description The STVM100 is a programmable VCOM adjustment solution for thin-film transistor (TFT) liquid-crystal displays (LCDs) to remove “flickers”. It is also used in e-paper and e-book applications to avoid the “ghosting” effect (residual pixels after display refresh).
PAGE 2
STVM100 Contents Contents 1 Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 2-wire bus characteristics and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1.1 Bus not busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1.2 Start data transfer . . . . . . . . . . .
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List of tables STVM100 List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. 4/28 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin names and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Bit P read and write mode values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
STVM100 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Connections diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
Device overview 1 STVM100 Device overview Figure 1. Logic diagram VDD AVDD SDA SCL OUT STVM100 SET WP GND AI12272 Table 2. Pin names and functions Name Type OUT Analog Adjustable sink current output pin. (1) See Section 3: Application information on page 12. AVDD Supply High-voltage analog supply. Bypass to GND with a 0.1 µF capacitor. WP Input GND VDD SDA SCL SET Function WRITE protectection. Active-low. To enable write operations to the DAC or to the EEPROM writing, connect to 0.
PAGE 6
STVM100 Device overview Figure 2. Connections diagram OUT AVDD WP GND 1 2 3 4 SET SCL SDA VDD 8 7 6 5 AI12273 Figure 3. Block diagram AVDD VDD 19R SDA SCL 7 I2C Interface OUT R DAC + – 7 SET EEPROM Block WP GND AI12274 Figure 4. Hardware hookup VDD 3.3V AVDD MCU I2C Interface 0.1μF VDD 0.
PAGE 7
Device operation 2 STVM100 Device operation The STVM100 operates as a slave device on the serial bus. Access is obtained by implementing a start condition, followed by the 7-bit slave address (1001111), and the eighth bit for READ/WRITE identification. The volatile DAC register and non-volatile EEPROM values can be read out or written in. 2.1 2-wire bus characteristics and conditions This bus is intended for communication between different ICs.
PAGE 8
STVM100 2.1.4 Device operation Data valid The data on the SDA line must be stable during the high period of the clock. The high or low state of the data line can only change when the clock signal on the SCL line is low (see Figure 5). The data on the line may be changed during the clock signal low period. There is one clock pulse per bit of data. Each data transfer is initiated with a start condition and terminated with a stop condition.
PAGE 9
Device operation 2.1.5 STVM100 Acknowledge Each byte of eight bits is followed by one acknowledge bit. This acknowledge bit is a low level signal put on the bus by the receiver, whereas the master generates an extra acknowledge-related clock pulse (see Figure 6). A slave receiver which is addressed is obliged to generate an acknowledge signal after the reception of each byte that has been clocked out of the slave transmitter.
PAGE 10
STVM100 2.2 Device operation Read mode In READ mode, after the start condition, the master sets the slave address (see Figure 7). Followed by the READ/WRITE mode control bit (R/W=1) and the acknowledge bit, the value in DAC register will be transmitted and the master receiver will send an acknowledge bit to the slave transmitter. Finally the stop condition will terminate the READ operation. In READ mode, the valid data is the first 7 bits and the P bit (the eight bit) is don’t care. 2.
PAGE 11
Application information 3 STVM100 Application information The STVM100 is a programmable VCOM calibrator to remove flickers in TFT-LCDs or to avoid the “ghosting effect” (residual pixels during refresh) in e-paper and e-books. It provides a digital I2C interface to control the sink current output. This output drives an external resistive voltage divider, which can then be applied to an external VCOM buffer. The highest and lowest VCOM value is determined by three resistors, R1, R2, and RSET.
PAGE 12
STVM100 Application information If the user-selected value is 0 (zero scale), the minimum current is sunk. The maximum VCOM value is obtained in Equation 3. Equation 3 R2 R1 1 V COM ( max ) = -------------------- ⋅ AV DD  1 – ---------- ⋅ --------------------------  128 20 ( R SET ) R1 + R2 If the user-selected value is 127 (full scale), the maximum current is sunk and the minimum VCOM value is obtained in Equation 4.
PAGE 13
Maximum ratings 4 STVM100 Maximum ratings Stressing the device above the ratings listed in the absolute maximum ratings table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
PAGE 14
STVM100 5 DC and AC parameters DC and AC parameters This section summarizes the operating measurement conditions, and the dc and ac characteristics of the device. The parameters in the DC and AC characteristics tables that follow, are derived from tests performed under the measurement conditions summarized in Table 5. Designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. Table 5.
PAGE 15
DC and AC parameters STVM100 Table 7. DC and AC characteristics Sym Description Test condition(1) Min Typ Max Unit Supply voltage 2.25 3.6 V VDD EEPROM programming supply voltage 2.25 3.6 V IDD(2) VDD supply current 50 µA AVDD Analog supply voltage VDD = 2.6 V to 3.6 V 4.5 20 V VDD = 2.25 V to 3.6 V 4.
PAGE 16
STVM100 DC and AC parameters Figure 9. Bus timing requirements sequence SDA tBUF tHD:STA tHD:STA tF tR SCL tHIGH P S tLOW tSU:DAT tHD:DAT tSU:STA tSU:STO SR P AI00589 Table 8. AC characteristics Sym Test Condition(1) Description Min Typ 0 Max Unit 400 kHz fSCL SCL clock frequency tLOW Clock low period 1.3 µs tHIGH Clock high period 0.
PAGE 17
Typical operating characteristics 6 STVM100 Typical operating characteristics Typical operating characteristics for the STVM100 are TA = 25 °C, VDD = 3 V, AVDD = 10 V, OUT = 1/2AVDD, and RSET = 24.9 kΩ except where noted. Figure 10. VDD supply current vs. VDD 27. 5 27 IDD (μA) 26.5 26 25.5 25 24.5 24 .2. 2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 VDD (V) AI13362 Figure 11. AVDD supply current vs. AVDD 10 9 8 IAVDD (μA) 7 6 5 4 3 2 1 0 4.5 6 7.5 9 10.5 12 13.5 15 16.5 18 19.
PAGE 18
STVM100 Typical operating characteristics Figure 12. VDD supply current vs. temperature 35 25 20 15 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature°C AI13364 Figure 13. AVDD supply current vs. temperature 4.95 4.9 4.85 IAVDD (μA) IDD (μA) 30 4.8 4.75 4.7 4.65 4.6 4.55 4.
PAGE 19
Typical operating characteristics STVM100 Figure 14. IOUT error vs. temperature (STVM100 at middle scale) 0.06 0.05 IOUT error (LSB) 0.04 0.03 0.02 0.01 0 -40 -20 0 20 40 60 80 Temperature°C AI13366 Figure 15. Total unadjusted error vs. DAC setting Total unadjusted error (LSB) 0.022474 0.020395 0.018316 0.016237 0.014158 0.012079 0.
PAGE 20
STVM100 Typical operating characteristics Figure 16. Differential non-linearity vs. DAC setting 0.2 Differential non-linearity (LSB) 0.15 0.1 0.05 0 -0.05 -0.1 -0.15 -0.2 1 17 33 49 65 81 97 113 DAC setting (decimal) AI13368 Figure 17. Integral non-linearity vs. DAC setting Integral non-linearity (LSB) 0.3 0.2 0.1 0 -0.1 -0.2 -0.
PAGE 21
Typical operating characteristics STVM100 Figure 18. AVDD power-up response 5ms/DIV AVDD: 5V/DIV, VDD: 5V/DIV, VOUT: 1V/DIV, VSET: 1V/DIV Figure 19.
PAGE 22
STVM100 Typical operating characteristics Figure 20.
PAGE 23
Package mechanical data 7 STVM100 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 21. TDFN8 3 x 3 x 0.75 mm, pitch 0.65, package mechanical data D D2 1 L E E2 8 e b A A3 A1 0.08 EZ_ME Note: Drawing is not to scale. Table 9.
PAGE 24
STVM100 Package mechanical data Figure 22. TSSOP8 – 8-lead, thin shrink small outline, 3 mm x 3 mm, mech. data D 8 5 c E1 1 E 4 A1 A L A2 L1 CP b e TSSOP8BM Note: Drawing is not to scale. Table 10. TSSOP8 – 8-lead, thin shrink small outline, 3 mm x 3 mm, mech. data mm inches Sym Typ Min A Max Min 1.100 A1 0.050 0.150 0.750 0.950 b 0.250 c 0.130 A2 Typ 0.850 CP Max 0.0433 0.0020 0.0059 0.0295 0.0374 0.400 0.0098 0.0157 0.230 0.0051 0.0091 0.0335 0.100 0.
PAGE 25
Part numbering 8 STVM100 Part numbering Table 11. Ordering information scheme Example: STVM100 DC 6 F Device type STVM100, VCOM calibrator with 7-bit DAC and I2C interface Package DC = TDFN8 DS = TSSOP8 Temperature range 6 = –40 to 85°C Shipping method E = ECOPACK® package, tubes F = ECOPACK® package, tape & reel For other options, or for more information on any aspect of this device, please contact the ST sales office nearest you.
PAGE 26
STVM100 9 Revision history Revision history Table 12. Document revision history Date Revision 09-May-2006 1 Initial release. 14-Jul-2006 2 Graphical and textual updates 3 Document status upgraded to Preliminary Data; changed the wording of Input function to include ‘WRITE operations’ instead of ‘programming’ in Table 2: Pin names and functions; deleted some bracketed text and modified the P bit function in Section 2.
PAGE 27
STVM100 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.