LM8300 [TI]
LM8300/LM8500 Four Wire Resistive Touchscreen Controller with Brownout;型号: | LM8300 |
厂家: | TEXAS INSTRUMENTS |
描述: | LM8300/LM8500 Four Wire Resistive Touchscreen Controller with Brownout |
文件: | 总26页 (文件大小:437K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LM8300, LM8500
www.ti.com
SNAS158B –OCTOBER 2002–REVISED MARCH 2013
LM8300/LM8500 Four Wire Resistive Touchscreen Controller with Brownout
Check for Samples: LM8300, LM8500
1
FEATURES
DESCRIPTION
The LM8300/8500 is a 4-wire resistive touch screen
controller. The controller samples and drives the
touch screen without the need of any external
2
•
Supports 4 Wire Resistive Touch Panels
•
Low Power Standby Current Typically Less
Than 2 µA at 5.5V
hardware. The built in 10-bit A/D provides
a
•
Maximum Speed of 500 Coordinate Pairs per
Second
maximum of 500 coordinate pairs per second (cpps).
The data sampled from the touch screen is sent out
on the UART at a speed of 38400 bps.
•
•
•
Automatic Wake Up and Return to Standby
10 bit A/D
The controller has a power-saving mode which
causes the controller to self-power down when no
touch is detected on the touch screen for a specified
amount of time. In the self-power down mode, the
current drawn is typically less than 2 µA. The device
resumes normal operation when a touch is detected
on the touch screen or communication is detected on
the UART. In addition to the self-power down mode,
the controller can be disabled by pulling the
SHUTDOWN pin low. The controller resumes normal
operation when the SHUTDOWN pin is tristated or
pulled high.
On-chip Touch Screen Current Drivers - No
External Driver Required
•
•
UART Interface
Controller Configurations are Stored in the
Internal Non-volatile Storage Element
•
Touch Pressure can be Measured
APPLICATIONS
•
•
•
•
•
•
•
Personal Digital Assistants
Smart Hand-Held Devices
Touch Screen Monitors
Point-of-Sales Terminals
KIOSK
The controller has an internal non-volatile memory
storage element to store configuration data such as
calibration points or controller configurations.
Pagers
Cell Phones
Table 1. Devices included in this datasheet
Operating
Voltage
Brownout
Voltage
Operating
Frequency
I/O
Pins
Device
LM8300
LM8500
Packages
Temperature
0°C to +70°C
0°C to +70°C
44 WQFN, 44 PLCC,
48 TSSOP
3, 5 V
5 V
2.7 to 2.9 V
3.27 MHz
18
18
44 WQFN, 44 PLCC,
48 TSSOP
4.17V to 4.5V
3.27, 10 MHz
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2002–2013, Texas Instruments Incorporated
LM8300, LM8500
SNAS158B –OCTOBER 2002–REVISED MARCH 2013
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Block Diagram
* This pin is available in the LM8500. It is unused in the LM8300.
2
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Connection Diagram
* This pin is available in the LM8500. It is
unused in the LM8300.
* This pin is available in the LM8500. It is
unused in the LM8300.
Figure 1. Top View
Figure 3. Top View
TSSOP Package
See Package Number DGG
PLCC Package
See Package Number FN0044A
* This pin is available in the LM8500. It is
unused in the LM8300.
Figure 2. Top View
WQFN Package
See Package Number NJN0044A
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PIN DESCRIPTIONS Pinouts for 44- and 48-Pin Packages
Pin Name
RESET
Direction
Pin Description
44-Pin WQFN
44-Pin PLCC
48-Pin TSSOP
I
I
Reset pin, pull low to reset
6
7
8
1
2
3
1
2
3
DTR
UART data terminal ready signal
WD_OUT
Watchdog output, tie to RESET pin for
correct function
O
I
CLK_SET(1)
Used to set if crystal is 3.3 MHz (low) or
10 MHz (floating or pulled high)
9
4
4
Unused(2)
Unused(2)
Unused(2)
Unused(2)
OSC_OUT
OSC_IN
Unused(2)
Unused(2)
UART_TX
10
11
12
13
14
15
16
17
18
5
6
5
6
7
7
8
8
O
I
Clock oscillator output
Clock oscillator input
9
9
10
11
12
13
10
11
12
13
O
I
UART transmit pin (inverted for use with
standard RS-232 drivers)
UART_RX
UART receive pin (inverted for use with
standard RS-232 drivers
19
20
14
15
14
15
SHUTDOWN
I
Shutdown pin, puts the device in halt
mode if pulled low
Unused(2)
Unused(2)
WAKE-UP
21
22
23
16
17
18
16
17
18
I
Used to wake up the processor from halt
mode with touch on touch screen
X+
Y-
I/O
I/O
I/O
I/O
Drives the X+ wire, also analog input
when sampling
24
25
26
27
19
20
21
22
19
20
21
22
Drives the Y- wire, also analog input
when sampling
X-
Drives the X- wire, also analog input
when sampling
Y+
Drives the Y+ wire, also analog input
when sampling
Unused(2)
Unused(2)
FILTER_OUT
FILTER_IN
GND
28
29
30
31
32
33
34
23
24
25
26
27
28
29
23
24
25
26
27
28
31
O
I
Analog output to the filter
Analog input from the filter
Digital ground
AGND
Analog ground
AVCC
Analog power supply, connect to filter
for best performance
VCC
Digital power supply
35
X
30
X
32
33
34
35
36
37
38
39
40
Unused(2)
Unused(2)
Unused(2)
Unused(2)
Unused(2)
Unused(2)
Unused(2)
Unused(2)
X
X
36
37
38
39
40
41
31
32
33
34
35
36
(1) This is available in the LM8500 only.
(2) These pins are for future functional expansions.
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PIN DESCRIPTIONS Pinouts for 44- and 48-Pin Packages (continued)
Pin Name
Direction
Pin Description
44-Pin WQFN
44-Pin PLCC
48-Pin TSSOP
LED
Output
Optional LED output, low when running,
high in halt-mode
42
37
41
Unused(3)
Unused(3)
Unused(3)
3
4
5
42
43
44
46
47
48
(3) These pins are for future functional expansions.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings(1)(2)
Supply Voltage (VCC
)
7V
−0.3V to VCC +0.3V
200 mA
Voltage at Any Pin
Total Current into VCC Pin (Source)
Total Current out of GND Pin (Sink)
Storage Temperature Range
ESD Protection Level
200 mA
−65°C to +140°C
2 kV (Human Body Model)
(1) Absolute maximum ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications are not
ensured when operating the device at absolute maximum ratings.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
Electrical Characteristics
DC Electrical Characteristics (0°C ≤ TA ≤ +70°C)
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Parameter
Conditions
Min
2.7
10
Typ
Max
5.5
50 x 106
Units
V
Operating Voltage
Power Supply Rise Time
Power Supply Ripple(1)
Supply Current(2)
High Speed Mode
CKI = 10 MHz
ns
Peak-to-Peak
0.1 VCC
V
VCC = 5.5V
VCC = 4.5V
11.5
5
mA
mA
CKI = 3.33 MHz
HALT Current with BOR Disabled(3)
High Speed Mode
VCC = 5.5V, CKI = 0 MHz
VCC = 5.5V
<2
10
45
µA
μA
V
Supply Current for BOR Feature
High Brownout Trip Level (BOR Enabled)
Low Brownout Trip Level (BOR Enabled)
Input Levels (VIH, VIL)
4.17
2.7
4.28
2.78
4.5
2.9
V
Logic High
0.8 VCC
V
V
Logic Low
0.16 VCC
2.5
Internal Bias Resistor for the CKI Crystal/Resonator
Oscillator
0.3
1.0
MΩ
Hi-Z Input Leakage
Input Pullup Current
Port Input Hysteresis
VCC = 5.5V
−0.5
−50
+0.5
μA
μA
V
VCC = 5.5V, VIN = 0V
−210
0.25 VCC
(1) Maximum rate of voltage change must be < 0.5 V/ms.
(2) Supply and IDLE currents are measured with CKI driven with a square wave Oscillator, CKO driven 180° out of phase with CKI, inputs
connected to VCC and outputs driven low but not connected to a load.
(3) The HALT mode will stop CKI from oscillating. Measurement of IDD HALT is done with device neither sourcing nor sinking current; all
inputs tied to VCC; A/D converter and clock monitor and BOR disabled.
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Electrical Characteristics
DC Electrical Characteristics (0°C ≤ TA ≤ +70°C) (continued)
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Parameter
Conditions
Min
−10
−6
10
Typ
Max
Units
mA
mA
mA
mA
mA
µA
Source(4)
Sink(4)
VCC = 4.5V, VOH = 4.2V
VCC = 2.7V, VOH = 2.4V
VCC = 4.5V, VOL = 0.3V
VCC = 2.7V, VOL = 0.3V
Output
Current
Levels
Outputs
X+, X-, Y+,
Y-
6
Allowable Sink and Source Current per Pin
Source (Weak Pull-Up Mode)
20
VCC = 4.5V, VOH = 3.8V
VCC = 2.7V, VOH = 1.8V
VCC = 4.5V, VOH = 3.8V
VCC = 2.7V, VOH = 1.8V
VCC = 4.5V, VOL = 1.0V
VCC = 2.7V, VOL = 0.4V
−10
−5
µA
Source (Push-Pull Mode)
−7
mA
mA
mA
mA
mA
μA
All Others
−4
Sink (Push-Pull Mode)(4)
10
3.5
Allowable Sink and Source Current per Pin
15
TRI-STATE Leakage
VCC = 5.5V
−0.5
+0.5
±200
Maximum Input Current without Latchup
RAM Retention Voltage, VR (in HALT Mode)
Input Capacitance
mA
V
2.0
7
pF
(4) Absolute Maximum Ratings should not be exceeded.
A/D Converter Electrical Characteristics (0°C ≤ TA ≤ +70°C) (Single-ended mode only)
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Parameter
Conditions
Min
Typ
Max
10
Units
Bits
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
V
Resolution
DNL
VCC = 5V
±1
DNL
VCC = 3V
±1
INL
VCC = 5V
±2
INL
VCC = 3V
±4
Offset Error
Offset Error
Gain Error
Gain Error
Input Voltage Range
VCC = 5V
±1.5
±2.5
±1.5
±2.5
VCC
0.5
6k
VCC = 3V
VCC = 5V
VCC = 3V
2.7V ≤ VCC < 5.5V
0
Analog Input Leakage Current
Analog Input Resistance(1)
Analog Input Capacitance
Operating Current on AVCC
µA
Ω
7
pF
AVCC = 5.5V
0.2
0.6
mA
(1) Resistance between the device input and the internal sample and hold capacitance.
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FUNCTIONAL DESCRIPTION
GENERAL
The LM8300/8500 is a 4-wire resistive touch screen controller. The primary communication is through the built in
UART operating at a baud rate of 38400. The LM8300/8500 has the ability to measure pressure on the Z-axis, in
addition to the X-Y coordinates.
The device has the capability to do a 2, 5, and 13 point calibration. All calibration data is stored in the internal
non-volatile storage element. In addition, all settings pertaining to the controller are stored internally. This feature
negates the need for external EEPROM.
The device has three built in averaging algorithms: oversampling, delta, and focus. These algorithms help to
minimize noise and A/D variation due to noise. Refer to the Averaging Algorithm section for a more detail
explanation. These algorithms are implemented on-chip, freeing the main processor from these tasks. To further
minimize noise in extremely noisy environments, the device has the ability to route the signal from the touch
panel to an external filtering stage before A/D conversions are performed.
To minimize power consumption, the device can be put into power save mode. The device can be set to go into
power save mode automatically or manually by pulling the external shutdown pin low.
ADVANCED PIN DESCRIPTIONS
CLK_SET — This pin is the selection pin used to determine the operating frequency of the controller. On power
up, the controller polls this pin to determine if the operating frequency is set to 10 MHz or 3.3 MHz. If the pin is
left floating or tied high, then the operating frequency is 10 MHz. If the pin is tied low, then the operating
frequency is set to 3.3 MHz.
NOTE
This is available on the LM8500 only.
SHUTDOWN — This is the external shut down pin. When pulled low, the controller goes into power saving
mode. This selection pin state has higher priority than the internal power save mode settings.
WAKE_UP — This pin is used to wake the controller from power save mode. When the device is in power save
mode, the pin must be tied to one of X-Y lines coming from the touch screen panel.
X+ — Connect to X+ terminal of the resistive screen.
X– — Connect to X– terminal of the resistive screen.
Y+ — Connect to Y+ terminal of the resistive screen.
Y– — Connect to Y– terminal of the resistive screen.
Filter_out — Analog output to external filter. The use of the external filter is controlled by sending a command
byte of $A0 on the UART to the controller.
Filter_in — Analog input from external filter. The use of the external filter is controlled by sending a command
byte of $A0 on the UART to the controller.
LED — Optional LED output. When the controller is operating in normal (non power save) mode, a low is output
to the pin. When the controller is in power save mode, a high is output to the pin.
RESET — Reset pin. When pulled low, a manual reset is executed. For normal operation, this pin must be pulled
high. Under no circumstances should the pin be left floating.
UART_TX — UART transmit pin. The signal is inverted for use with standard RS-232 drivers.
UART_RX — UART receive pin. The signal is inverted for use with standard RS-232 drivers.
DTR — Data Terminal Ready signal for the UART. If a high level is detected on the pin, this signals that the
UART is not ready. If a low level is detected on the pin, this signals that the UART is ready.
WD_Out — Watch dog output. For correct operation, this pin should be connected to the RESET pin.
OSC_OUT — Clock oscillator output pin.
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OSC_IN — Clock oscillator input pin
GND — Digital Ground
AGND — Analog ground
DVCC — Digital power supply.
AVCC — Analog power supply. For best performance, this pin should be connected to a filter.
Users of the WQFN package are cautioned to be aware that the central metal area and the pin 1 index mark on
the bottom of the package may be connected to GND. See Figure 4 below:
Figure 4. WQFN Package Bottom View
USART FRAMING FORMAT
The device communicates with the touch screen driver using the UART set at a baud rate of 38400, 8, n, 1.
All communication from the host software and the controller consists of a command byte and occasionally data
byte(s). If data byte(s) follow a command byte, it must be sent directly after the command byte. If the device is in
the power save mode, a delay must be inserted between the wake up command and the command byte. Refer to
the Power Save Mode (Low Power Stand-by) section for more details. For every command byte sent to the
controller, an acknowledge byte is sent back and sometimes data byte(s).
A command byte is distinguished by having the 7th bit of the command byte set (1). If any data byte(s) is to
follow, the 7th bit of the data byte is reset (0).
Data packets sent to the host software can be either four or five bytes in length. If the pressure measurement is
enabled, five bytes are sent. If the pressure measurement is not enabled, four bytes are sent.
The first byte of each data packet is a header byte. This header byte is used to synchronize and differentiate
between four or five byte packages. If a four byte data package is sent, the 4th bit of the header byte is reset (0).
If a five byte data package is sent, the 4th bit of the header byte is set (1).
The 6th bit of the second byte of the data packet is used to indicate the touch state. If the bit is set (1), then a
touchdown or continuous touch is detected. If the bit is reset (0), then a liftoff is detected.
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Data packet format table
Bit 7
Bit 6
0
Bit 5
0
Bit 4
L
Bit 3
0
Bit 2
0
Bit 1
0
Bit 0
0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
1
0
0
0
0
S
X2
X8
Y8
Z5
X1
X7
Y7
Z4
X0
X6
Y6
Z3
Y2
X5
Y5
Z2
Y1
X4
Y4
Z1
Y0
X3
Y3
Z0
X9
Y9
Z6
L – Package length. (0 = 4 bytes, 1 = 5 bytes)
S – Touch state (0 = liftoff, 1 = touchdown or continuous touch)
XX – X position (10 bit value)
YY – Y position (10 bit value)
ZZ – Z positon (7 bit value), this byte is only transmitted if the pressure measurement is enabled
Command Bytes
PC
Byte 2
TSC
Byte 2
PC Command
PC Byte 1
$B0
TSC Byte 1
$CA
Read clock-speed (3,33MHz,
10MHz)
$00, $01
Read parameters
$B1
$B2
$CA
$C7
See Advanced Command Bytes
Descriptions
Read software version number
See Advanced Command Bytes
Descriptions
Read # of calibration points
Read stored calibration points
$B3
$B4
$CA
$CA
$00, $02, $05, $0D
See Advanced Command Bytes
Descriptions
Set focus value (# of pixels on touch $B8
panel)
$0-$3F
$CA
$00-$3F
Set # of samples per coordinate (1, $BA
2, 4, 8, 16, 32)
$01, $02, $04, $08, $10, $20 $CA
$01, $02, $04, $08, $10, $20
$01, $02, $04
$00-$3F
Set communication mode (stream,
touchdown, liftoff)
$BB
$BC
$BD
$BE
$01, $02, $04
$00-$3F
$CA
$CA
$CA
Set max delta (# of pixels from
predicted coordinate)
Set calibration points
See Advanced Command
Bytes Descriptions
See Advanced Command Bytes
Descriptions
Set minimum pressure
$00-$7F
$CA
$CA
$00-$7F
$00, $01
Toggle disable/enable external filter $A0
path
Toggle disable/enable self power-
down
$A2
$CA
$00, $01
Toggle disable/enable echo mode
$A3
$A4
$CA
$CA
$00, $01
$00, $01
Toggle disable/enable pressure
measurements
Toggle disable/enable calibration
coordinate check
$A5
$CA
$00, $01
Wakeup
$A7
$A8
$AF
Shutdown
Soft reset
TSC Replies
Timeout
$CA
$CA
$CB, $CC
$CF
$CE
Re-send
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PC
Byte 2
TSC
Byte 2
PC Command
Self test failed
PC Byte 1
TSC Byte 1
$CC
Self test ok
$CB
Acknowledge
$CA
Calibration coordinates ok
Error / buffer overrun
Software version
Data transmit
$C4
$C8
$C7
$0-$7F
Payload (3/4 bytes)
$80/$90
Advanced Command Bytes Descriptions
Unless otherwise mentioned, all values are in hex.
$B0: Read clock-speed
Reply Byte #1: $CA (Acknowledge)
Byte #2: Clock readout (0 = 3.3MHz, 1 = 10MHz)
CLK_SEL pin tells the firmware which oscillator speed is used. If the CLK_SEL input pin is floating or pulled high
a 10.0MHz oscillator must be connected. If the pin is pulled low a 3.3MHz oscillator must be connected. This
command enables the driver software to determine which oscillator speed is used with the touch screen
controller, as this determines the maximum coordinate pair per second data rates.
NOTE
This is available in the LM8500 only.
$B1: Read parameters
Reply Byte #1: $CA (Acknowledge)
Reply Byte #2: First byte in software version number, year 20 (00-99)
Reply Byte #3: Communication mode (1 = stream, 2 = touchdown, 4 = liftoff)
Byte #4: Wakeup on touch (0 = disabled, 1 = enabled)
Reply Byte #5: Number of samples (1,2, 4, 8, 16 or 32)
Byte #6: Clock readout (0 = 3.3MHz, 1 = 10MHz)
Byte #7: Second byte in software version number, month (1-12)
Byte #8: Third byte in software version number, day (1-31)
Byte #9: Focus value (0-63)
Byte #10: Max delta (0-63)
Byte #11: Number of calibration coordinates (0, 2, 5 or 13)
Byte #12: Toggle-flags:
Bit #5: calibration coordinates check (0=disabled, 1=enabled)
Bit #4: Pressure measurement (0=disabled, 1=enabled)
Bit #3: Echo mode (0=disabled, 1=enabled)
Bit #2: Self Power-Down mode (0=disabled, 1=enabled)
Bit #1: Unused
Bit #0: External filter path (0=disabled, 1=enabled)
Byte #13: Pressure threshold for valid touch
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This command allows the user to read all the selected parameters. It is primary intended to aid in debugging.
This command can also be used if a configuration utility needs to determine the current setting of controller.
$B2: Read software version number
Reply Byte #1: $C7 (Software version number)
Byte #2: First byte in version number, year 20 (00-99)
Byte #3: Second byte in version number, month (1-12)
Byte #4: Third byte in version number, day (1-31)
$B3: Read # of calibration points
Reply Byte #1: $CA (Acknowledge)
Byte #2: ($00 — no calibration done, $02 — 2 points, $05 — 5 points or $0D — 13 points)
$B4: Read stored calibration points
Reply Byte #1: $CA (Acknowledge)
Byte #2: ($00 — no calibration done, $02 — 2 points, $05 — 5 points or $0D — 13 points)
Byte #3: X-max (2 MSB for coordinate 1)
Byte #4: X-min (8 LSB for coordinate 1)
Byte #5: Y-max (2 MSB for coordinate 1)
Byte #6: Y-min (8 LSB for coordinate 1)
Continue until all coordinates have been sent. A zero is send back if calibration has not been performed and
there are no data bytes.
$B8: Set focus value
Byte #2: Focus value (0-63)
Reply Byte #1: $CA (Acknowledge)
Byte #2: Focus value (0-63)
The set focus command allows the setting of different values to improve touch screen focusing. Focusing is
defined as the ability of the touch screen controller to detect exactly identical coordinate values from
measurement to measurement if the pointer on the touch screen has not moved. The focus values are equivalent
to pixels of touch screen resolution. If for example a value of 2 is selected, this means that every coordinate
value that is within two pixels of the previously measured coordinate value is considered to be identical to that
previous value and that in this case the touch screen controller transmits the previous coordinate information.
This keeps the mouse pointer steady at the point being touched, rather than "jumping around" the point. A Focus
value of zero disables the focusing algorithm. The default setting is 4.
$BA: Set number of samples per coordinate
Byte #2: Number of samples per coordinate ($01 - 1 samples/coordinate, $02 - 2 samples/coordinate, $04
- 4 samples/coordinate, $08 - 8 samples/coordinate, $10 - 16 samples/coordinate, $20 - 32
samples/coordinate)
Reply Byte #1: $CA (Acknowledge)
Byte #2: Number of samples per coordinate ($01 - 1 samples/coordinate, $02 - 2 samples/coordinate, $04
- 4 samples/coordinate, $08 - 8 samples/coordinate, $10 - 16 samples/coordinate, $20 - 32
samples/coordinate)
This command allows the selection of different sample numbers per X, Y, and Z coordinates. The higher the
number of samples per X, Y, and Z coordinates, the better the accuracy, but the lower the coordinates per
second data rate. The default setting is 8.
$BB: Set communication mode
Byte #2: Communication mode ($01 = stream, $02 = touchdown, $04 = liftoff)
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Reply Byte #1: $CA (Acknowledge)
Byte #2: Communication mode ($01 = stream, $02 = touchdown, $04 = liftoff)
See the COMMUNICATION MODES section for a description of the stream, touchdown and liftoff modes. This
command selects the communication mode. The default setting is stream mode.
$BC: Set max delta
Byte #2: Max delta value (0-63)
Reply Byte #1: $CA (Acknowledge)
Byte #2: Max delta value (0-63)
See the Averaging Algorithm section for a detailed description of this setting. Simply put, this command sets how
much the "coordinate velocity" can change from one coordinate to the next. The default setting is 8.
$BD: Set calibration points
Byte #2: High nibble: Number of calibration points ($01 = two, $02 = five, $04 = thirteen)
Low nibble: Active calibration cross (1-13 = cross #)
Reply Byte #1: $CA (Acknowledge)
Byte #2: High nibble: Number of calibration points ($01=two, $02=five, $04=thirtheen)
Low nibble: Active calibration cross # (1-13)
Refer to the Calibration section for details.
$BE: Set minimum pressure
Byte #2: Minimum pressure value (0-127)
Reply Byte #1: $CA (Acknowledge)
Byte #2: Minimum pressure value (0-127)
This setting controls how high the pressure (Z-axis) must be in order for samples to be accepted. Setting this
value too low may result in having faulty coordinates accepted. This value is internally multiplied by two in the
controller (due to the 7-bit limitation in the communication format, which can not send 8-bit values larger than 127
in one byte). The default setting is 40.
$A0: Toggle disable/enable external filter path
Reply Byte #1: $CA (Acknowledge)
Byte #2: (0 = now disabled, 1 = now enabled)
This command enable/disable external filter path. The external filter path enabled option will require the addition
of a single external low pass filter (either R/C or active OpAmp based), which is then applied to the touch screen
signal lines. This option can be used in high noise environments to significantly improve performance and
accuracy of the touch screen controller.
The default setting is filter path enabled.
$A2: Toggle disable/enable self-power down
Reply Byte #1: $CA (Acknowledge)
Byte #2: (0 = now disabled, 1 = now enabled)
This command can switch between self-power down mode enable or disabled. Refer to the Power Save Mode
(Low Power Stand-by) section for details. The default setting is Self-Power Down mode enabled. If the echo
mode is enabled, any command byte send to the device will be echo back and executed.
$A3: Toggle disable/enable echo mode
Reply Byte #1: $CA (Acknowledge)
Byte #2: (0 = now disabled, 1 = now enabled)
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The echo mode is available for debugging purposes. If enabled, the touch screen controller will echo back any
data that is received via the UART interface.
The default setting is Echo mode disabled.
$A4: Toggle disable/enable pressure measurement
Reply Byte #1: $CA (Acknowledge)
Byte #2: (0 = now disabled, 1 = now enabled)
The pressure measurement sets the touch screen to also sample the Z-axis when reading the X and Y
coordinates.
The default setting is pressure measurement enabled.
$A5: Toggle disable/enable calibration checking.
Reply Byte #1: $CA (Acknowledge)
Byte #2: (0 = now disabled, 1 = now enabled)
If the cablibration checking is enabled, the cablibration mapping must be the values shown in ??? to ???.
$A7: Wakeup
There is no reply byte to this command.
When the self-power down mode of the device is enabled, the touch screen driver must send a wakeup
command prior to any command byte(s). If the self-power down mode of the TSC is enabled. The wakeup
command must also to be sent if the driver puts the TSC in power-down mode via the shutdown command.
$A8: Shutdown
Reply Byte #1: $CA (Acknowledge)
When the TSC driver wants the controller to go into power save mode it sends a shutdown command to the
controller. The driver needs to send a wakeup to the controller before starting up the communication again.
With the TSC has the self-power-down mode enabled, then a touchdown on the touch screen will wake-up the
TSC from shutdown mode in addition to sending the wake up command. If the self-power-down mode is
disabled, then only the wakeup command can wake-up the controller from shutdown mode (i.e. wake-up on
touchdown is disabled).
$AF: Soft reset (restart the controller)
Reply Byte #1: $CA (Acknowledge)
Byte #2: $CB/$CC (Self test OK/Self test fail)
When the PC driver sends the soft reset command, the touch screen controller executes a soft reset, which
clears and re-initializes all internal RAM configuration registers from on-chip FLASH and performs a self-check of
internal RAM and program memory.
CONTROLLER REPLIES
$CF: Timeout.
Communication timeout has occurred, and current command has been aborted.
$CE: Re-send
Request the TSC driver to resend the last command. This command is used if the controller does not understand
the received command or a buffer overrun condition occurs.
$CC: Self test fail (done at startup, reset, and after calibration)
$CB: Self test OK (done at startup, reset, and after calibration)
$CA: Acknowledge
$C4: Calibration coordinates OK
This is sent if the coordinates are within the predefined value.
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$C8: Error / TX Buffer overrun
This is added to the last place in transmit buffer to signal that a buffer overrun has occurred.
$C7: Software Version number
Byte #2: First byte of version number
Byte #3: Second byte of version number
Byte #4: Third byte of version number
$80: Format tablet for Z-axis disabled (see Data packet format table section for more info.)
Byte #2: Status, low X and low Y
Byte #3: High X
Byte #4: High Y
$90: Format tablet for Z-axis enabled (see Data packet format table section for more info.)
Byte #2: Status, low X and low Y
Byte #3: High X
Byte #4: High Y
Byte #5: Z-axis (0-127)
Oscillator
OSC_IN is the clock input while OSC_OUT is the clock generator output to the crystal. Table 2 shows the
component values required for various standard crystal values. Figure 5 shows the crystal oscillator connection
diagram.
Figure 5.
Table 2. Crystal Oscillator Configuration,
TA = 25°C, VCC = 5V
CKI Freq.
(MHz)
C1 (pF)
C2 (pF)
18
18
10
18–36
18–36
3.27
The crystal and other oscillator components should be placed in close proximity to the OSC_IN and OSC_OUT
pins to minimize printed circuit trace length.
The values for the external capacitors should be chosen to obtain the manufacturer's specified load capacitance
for the crystal when combined with the parasitic capacitance of the trace, socket, and package (which can vary
from 0 to 8 pF). The guideline in choosing these capacitors is:
Manufacturer's specified load cap = (C1 * C2) / (C1 + C2) + Cparasitic
C2 can be trimmed to obtain the desired frequency. C2 should be less than or equal to C1.
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Power Save Mode (Low Power Stand-by)
The power consumption of the controller can be minimized by enabling the low power stand by mode. The power
save mode can be controlled internally by sending a command of $A2 to the controller, externally by pulling the
SHUTDOWN pin low, or by issuing a driver shutdown command of $A8.
The self power down mode is enabled/disabled by sending a command of $A2 to the controller. When enabled,
the controller automatically goes into low power stand by if no more touch activity is detected or if there is no
UART communication. The controller automatically comes out of low power stand by mode when a touch is
detected on the touch panel or if an incoming communication on the UART is detected. In the low power stand
by mode, all activity is disabled, including the oscillator. Also, the LED pin is driven high. To wake up the
controller on the UART, the wake up command byte must be sent, followed by a minimum time delay of 1ms for
the LM8500 and 3ms for the LM8300 before sending any command byte. The delay time is needed to allow the
oscillator to restart and stabilize. Table 3 shows the average startup time for a given operating frequency.
The SHUTDOWN pin will shut down the controller when pulled low. When the SHUTDOWN pin is pulled low, the
controller will continue to be in the low power stand by mode until the pin is pulled high or released. While the
SHUTDOWN pin is pulled low, all activities are stopped and any touch or communication will be ignored.
Immediately following the SHUTDOWN pin being released or pulled high, the controller clears the UART transmit
and receive buffers and resumes normal operation.
The controller can be put in the low power stand by mode by sending a $A8 command to it. Upon receiving this
command, the controller goes into low power stand by mode. If the self power down mode is enabled and the
controller is put into low power stand by mode, the controller will wake up if the wake up command ($A7) is
received or if a touch is detected on the touch panel. If the self power down mode is disabled and the controller
is put into low power stand by mode, the controller can only be woken up if it receives the wakeup command.
After the controller wakes up, the UART transmit and receive buffers are cleared and resume normal operation.
Table 3. Startup Times
CKI Frequency
10 MHz
Startup Time
1–10 ms
3.33 MHz
3–10 ms
Averaging Algorithm
To achieve better accuracy and noise filtering, each X, Y, and Z coordinate is oversampled by specific amount.
The possible oversampling settings are 1, 2, 4, 8, 16, and 32. The factory setting is 8. The greater the
oversampling, the greater the accuracy, but the lower the CPPS.
Table 4. Samples per coordinate vs. CPPS for LM8300
Samples
Coordinate pairs
per coordinate
per second (CPPS)
1
250
220
190
150
100
65
2
4
8
16
32
Table 5. Samples per coordinate vs. CPPS for LM8500
Samples
Coordinate pairs
per coordinate
per second (CPPS)
1
500
430
360
270
190
2
4
8
16
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Table 5. Samples per coordinate vs. CPPS for LM8500 (continued)
32
110
DELTA ALGORITHM
The delta filter is used to remove large variations in sampled values due to noise and glitches. The delta filter
tries to predict where the next coordinate could be. This is done by taking the two previous coordinates and
subtracting one from the other, producing a delta value. This delta value is then added or subtracted to the last
coordinate. The resulting value is the predicted coordinate. If the new sampled coordinate is close to this
predicted value, then the new value is accepted as valid and is passed to the focus algorithm, provided the focus
algorithm is enabled. If the new sampled coordinate is not close to the predicted coordinate, then the value is
discarded and is stored to be used in the following delta calculations.
The number by which the new sampled coordinate can differ from the predicted coordinate is controlled by
setting the Set Max Delta value. The Set Max Delta value can be from a value of 0-63. The factory default is 8.
FOCUS ALGORITHM
The focus algorithm removes some inaccuracy and noise that could cause the coordinate to differ only by a
couple of pixels. The focus algorithm is used to eliminate the "jittering" effect of the pointer when the pointer is
stationary.
The focus algorithm compares the value of the previous stored value to the value passed from the delta
algorithm and determines if the difference is greater than or equal to the Set Focus Value. If the difference is
greater or equal to the value in Set Focus Value then the new coordinate is sent out through the UART and
stored as the previous value. If the difference is less than the Set Focus Value then the value is discarded and
the stored valued is set through the UART.
The amount of difference between the new coordinate and the old coordinate is set in the Set Focus Value. This
value can be from 0-63 with a value of 0 disabling the focus algorithm. The factory default is 4.
COMMUNICATION MODES
Liftoff
When set to the liftoff mode, the controller only sends data through the UART on liftoff. The controller
continuously samples the touchscreen as long as there is a touch detected on the touchscreen but only the last
coordinate is sent out to the UART.
Touchdown
When set to the touchdown mode, the controller only sends data through the UART on touchdown. The controller
continuously samples the touchscreen as long as there is a touch detected on the touchscreen but only the first
coordinate is sent out to the UART.
Streaming
When set to the streaming mode, the controller continuously sends data through the UART as long as there is a
touch detected on the touchscreen.
Brownout Reset
The device is initialized when the RESET pin is pulled low or the On-chip Brownout Reset is activated.
The RESET input initializes the device when pulled low. The RESET pin must be held low for a minimum of
0.5µs for the LM8500 and a minimum of 1.5µs for the LM8300 to guarantee a valid reset. Reset should also be
wide enough to ensure crystal start-up upon power-up. The R/C circuit shown in Figure 6 is an optional circuitry
that will provide a delay 5 times (5x) greater than the power supply.
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Figure 6. Optional Reset Circuit using External Reset
When enabled, the device generates an internal reset as VCC rises. While VCC is less than the specified brownout
voltage (Vbor), the device is held in the reset condition for tid = 120-128 µs for the LM8500 and tid = 360-384 µs
for the LM8300. Once the tid reaches zero, the internal reset is released and the controller resume normal
operation. This internal reset will perform the same functions as external reset. Once VCC is above the Vbor and tid
reaches zero, instruction execution begins. If, however, VCC drops below the selected Vbor, an internal reset is
generated, and tid is set to 120-128 µs for the LM8500 and 360-384 µs for the LM8300. The device now waits
until VCC is greater than Vbor, at which time the countdown starts over. When enabled, the functional operation of
the device, at frequency, is guaranteed down to the Vbor level.
One exception to the above is that the brownout circuit will insert a delay of approximately 3 ms on power up or
any time the VCC drops below a voltage of about 1.8V. The device will be held in Reset for the duration of this
delay before tid starts count down. This delay starts as soon as the VCC rises above the trigger voltage
(approximately 1.8V). This behavior is shown in Figure 7.
In Case 1, VCC rises from 0V and the on-chip RESET is undefined until the supply is greater than approximately
1.0V. At this time the brownout circuit becomes active and holds the device in RESET. As the supply passes a
level of about 1.8V, a delay of about 3 ms (td) is started and tid is preset with 120-128 µs for the LM8500 or 360-
384 µs for the LM8300. Once VCC is greater than Vbor and td has expired, tid starts to count down.
Case 2 shows a subsequent dip in the supply voltage which goes below the approximate 1.8V level. As VCC
drops below Vbor, the internal RESET signal is asserted. When VCC rises back above the 1.8V level, td is started.
Since the power supply rise time is longer for this case, td has expired before VCC rises above Vbor and tidstarts
immediately when VCC is greater than Vbor
.
Case 3 shows a dip in the supply where VCC drops below Vbor, but not below 1.8V. On-chip RESET is asserted
when VCC goes below Vbor and tid starts as soon as the supply goes back above Vbor
.
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Figure 7. Brownout Reset Operation
The internal reset will not be turned off until tid counts down to zero. The internal reset will perform the same
functions as external reset. The device is guaranteed to operate at the specified frequency down to the specified
brownout voltage. After the underflow, the logic is designed such that no additional internal resets occur as long
as VCC remains above the brownout voltage.
The device is relatively immune to short duration negative going VCC transients (glitches). Proper filtering of the
VCC power supply voltage is essential for proper brownout functionality. Power supply decoupling is vital even in
battery powered systems.
There are two optional brownout voltages. The part numbers for the two versions of this device are:
LM8500, Vbor = high voltage range.
LM8300, Vbor = low voltage range.
Refer to the device specifications for the actual Vbor voltages.
High brownout voltage devices are guaranteed to operate at 10MHz down to the high brownout voltage. Low
brownout voltage devices are guaranteed to operate at 3.33MHz down to the low brownout voltage. Low
brownout voltage devices are not guaranteed to operate at 10MHz down to the low brownout voltage.
Under no circumstances should the RESET pin be allowed to float. The RESET input may be connected to an
external pull-up resistor to VCC or to other external circuitry. The output of the brownout reset detector will always
preset tid to a value between 120-128µs for the LM8500 and 360-384µs for the LM8300. At this time, the internal
reset will be generated.
The device has a built in watchdog monitoring module to prevent runaway code. To use the watchdog feature,
the WD_OUT pin must be connected to the RESET pin. The WD_OUT pin has an internal weak pull-up so that,
when the WD_OUT pin is connected to the RESET pin, the RESET pin does not require an external pull-up
resistor to VCC
.
Calibration
The device supports two, five, and thirteen point calibration. If desired, the calibration points can be stored
internally in the non-volatile storage element. During calibration time, the device has the unique ability to check if
the calibration points make sense. For instance, if the desired calibration point was to be at the upper left hand
corner, but by accident, the actual point detected was at the lower right hand corner, the device will reject this
point. This ensures the calibration process is not performed incorrectly.
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The calibration checking, can be enabled or disabled. If the calibration checking is enabled, the controller will
always check the current calibration point being done against the theoretical point and determine if the value is
within ±127 of the raw A/D values. If this option is desired, the touch screen driver must perform the calibration
according to the calibration mapping for the two, five, and thirteen points as shown in Figure 8, Figure 9, and
Figure 10, respectively. The theoretical values for the two, five, and thirteen points are shown in Table 6, Table 7,
and Table 8 respectively.
Figure 8. Two Points Calibration Mapping
Figure 9. Five Points Calibration Mapping
Figure 10. Thirteen Points Calibration Mapping
Table 6. Two Points Calibration
Calibration point
Theoretical X-value
Theoretical Y-value
1
2
127
895
127
895
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Table 7. Five Points Calibration
Calibration point
Theoretical X-value
Theoretical Y-value
1
2
3
4
5
127
895
127
511
895
127
895
895
511
127
Table 8. Thirteen Points Calibration
Calibration point
Theoretical X-value
Theoretical Y-value
1
2
127
895
127
511
895
895
511
127
511
623
623
319
319
127
895
895
511
127
511
895
511
127
319
623
623
319
3
4
5
6
7
8
9
10
11
12
13
GENERAL CALIBRATION PROCEDURES
Calibration is invoked by sending a command byte of $BD followed by a command byte to the device. The
command byte is broken into two parts: the high nibble states the number of calibration points to performs and
the lower nibble states the active calibration point. For example, to do the first calibration point for the two point
calibration, the command bytes of $BD and $11 are sent to the device. The device then echos $BD and $11
back to the TS driver and waits for a touch on the panel. When a touch is detected, the device checks to see if
the point is within the specified parameters if the calibration point checking is enabled. If the calibration point
checking is disabled, the device will send a $C8 for OK byte to the TS driver regardless of where the touch was
detected. This calibration point checking can be enabled or disabled by sending a command byte of $A5 to the
device. When all the calibration points are done, the device will do a self-test and send a command of $CB for
OK or a command of $CC for failed. If a $CC is received, the TS driver should issue a warning stating the
calibration was not done properly and redo the calibration procedures. The flowchart for the calibration
procedures is shown in Figure 11.
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Figure 11. Calibration Procedures with Coordinates Checking Enabled
CALIBRATION PROCEDURES WITH COORDINATES CHECKING ENABLED
To do TS calibration with coordinates checking enabled, first ensure the Calibration Coordinates Checking is
enabled on the device. This can be accomplished by sending a command byte of $B1 (Read Parameters
command) and checking the 5th bit of the 12th reply byte is set. Alternatively, if the device is set to Calibration
Coordinates Checking enabled as default, this step can be skipped.
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The TS driver sends the command byte to do calibration ($BD). The TS driver should wait for the reply bytes and
ensure it is the same command bytes it sent. The device waits for a touch to be detected on the panel. Once a
touch is detected, the device checks it against the predetermined calibration values as noted on Table 6,
Table 7 , and Table 8. If the detected touch is within the predefined value (±127 of the raw A/D value), the device
will send a command of $C4 to the TS driver and store the calibration point in the internal flash. The TS driver
can now send a command byte to do the next calibration point. If the detected touch is not within the predefined
value, the device will send a reply byte of $C8 to the TS driver. Upon receiving this reply byte, the TS driver can
resend the calibration command for the same calibration point, go the next calibration point, or abort the
calibration process.
Once all the calibration points are done, the device does a self-test. If the self-test was not successful, the device
will send a reply byte of $CC to the TS driver. At this point, the TS driver should either notify the user to redo the
calibration point or automatically redo the calibration again. If the self-test was successful, the device will send a
reply byte of $CB to the TS driver.
CALIBRATION PROCEDURES WITH COORDINATES CHECKING DISABLED
To do TS calibration with coordinates checking disabled, first ensure the Calibration Coordinates Checking is
disabled on the device. This can be accomplished by sending a command byte of $B1 (Read Parameters
command) and checking the 5th bit of the 12th reply byte is not set. Alternatively, if the device is set to
Calibration Coordinates Checking disabled as default, this step can be skipped.
The TS driver sends the command byte to do calibration ($BD). The TS driver should wait for the reply bytes and
ensure it is the same command bytes it sent. The device waits for a touch to be detected on the panel. Once a
touch is detected, the device save the values into the internal flash and send a reply byte of $C4 to the TS driver.
The TS driver can now send a command byte to do the next calibration point. Since the Calibration Checking is
disabled, the TS driver should ensure the calibration point is within the range of the calibration cross.
Once all the calibration points are done, the device does a self-test. If the self-test was not successful, the device
will send a reply byte of $CC to the TS driver. At this point, the TS driver should either notify the user to redo the
calibration point or automatically redo the calibration again. If the self-test was successful, the device will send a
reply byte of $CB to the TS driver.
Revision History
Date
October 2002
May 2003
Section
Summary of Changes
Initial release.
All sections
Removed LM8400 part.
Brownout Reset
Updated section to reflect the change and made external reset circuitry optional.
Added command byte $A5
July 2003
Advanced Command Bytes
Descriptions
Updated controller reply bytes
December 2003
March 2013
Advanced Command Bytes
Descriptions
Added description for command byte $A5
All Sections
Changed layout of National Data Sheet to TI format
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PACKAGE OPTION ADDENDUM
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18-Oct-2013
PACKAGING INFORMATION
Orderable Device
LM8300IMT9B/NOPB
LM8500IMT9B/NOPB
Status Package Type Package Pins Package
Eco Plan
Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
0 to 70
Device Marking
Samples
Drawing
Qty
(1)
(2)
(6)
(3)
(4/5)
ACTIVE
TSSOP
TSSOP
DGG
48
48
38
Green (RoHS
& no Sb/Br)
SN | CU SN
Level-2-260C-1 YEAR
LM8300IMT9
ACTIVE
DGG
38
Green (RoHS
& no Sb/Br)
SN | CU SN
Level-2-260C-1 YEAR
0 to 70
LM8500IMT9
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
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Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
18-Oct-2013
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Addendum-Page 2
MECHANICAL DATA
MTSS003D – JANUARY 1995 – REVISED JANUARY 1998
DGG (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
48 PINS SHOWN
0,27
0,17
M
0,08
0,50
48
25
6,20
6,00
8,30
7,90
0,15 NOM
Gage Plane
0,25
1
24
0°–8°
A
0,75
0,50
Seating Plane
0,10
0,15
0,05
1,20 MAX
PINS **
48
56
64
DIM
A MAX
12,60
12,40
14,10
13,90
17,10
16,90
A MIN
4040078/F 12/97
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold protrusion not to exceed 0,15.
D. Falls within JEDEC MO-153
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