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參數(shù)資料
| 型號(hào)： | LM8300HLQ9/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, QCC44 |
| 封裝： | LLP-44 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 327K |
| 代理商： | LM8300HLQ9/NOPB |
8.0 Electrical Characteristics (Continued)
DC Electrical Characteristics (0C
≤ T
A ≤ +70C) (Continued)
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Parameter
Conditions
Min
Typ
Max
Units
Input Capacitance
7pF
Note 4: Maximum rate of voltage change must be < 0.5 V/ms.
Note 5: 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.
Note 6: 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.
Note 7: Absolute Maximum Ratings should not be exceeded.
A/D Converter Electrical Characteristics (0C
≤ T
A ≤ +70C) (Single-ended
mode only)
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Parameter
Conditions
Min
Typ
Max
Units
Resolution
10
Bits
DNL
V
CC =5V
±1
LSB
DNL
V
CC =3V
±1
LSB
INL
V
CC =5V
±2
LSB
INL
V
CC =3V
±4
LSB
Offset Error
V
CC =5V
±1.5
LSB
Offset Error
V
CC =3V
±2.5
LSB
Gain Error
V
CC =5V
±1.5
LSB
Gain Error
V
CC =3V
±2.5
LSB
Input Voltage Range
2.7V
≤ V
CC < 5.5V
0
V
CC
V
Analog Input Leakage Current
0.5
A
Analog Input Resistance (Note 8)
6k
Analog Input Capacitance
7pF
Operating Current on AV
CC
AV
CC = 5.5V
0.2
0.6
mA
Note 8: Resistance between the device input and the internal sample and hold capacitance.
9.0 Functional Description
9.1 GENERAL
The LM8300/8500 is a 4-wire resistive touch screen control-
ler. 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: oversam-
pling, 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 algo-
rithms 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.
9.2 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 fre-
quency 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.
LM8300/LM8500
www.national.com
8
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