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參數(shù)資料
| 型號： | SH2165-FGT |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 0.50 MM PITCH, ROHS COMPLIANT, LQFP-64 |
| 文件頁數(shù)： | 31/33頁 |
| 文件大?。?/td> | 354K |
| 代理商： | SH2165-FGT |
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BUILT-IN SENSOR PROFILES
SENSOR CONFIGURATION VALUES
Copyright 1999-2005 Semtech Corporation
SH2165 data sheet v1.08 (2005-05-17)
www.semtech.com
7
SH2165
SENSOR CONFIGURATION VALUES
The SH2165 includes three single-byte registers for the following values:
X- and Y-axis gain
Z-axis gain
X and Y direction
With the appropriate values in these registers, the SH2165 can support any
strain-gauge pointing device.
The user can adjust the values in these registers in any of the following
ways:
Pick resistance values for R1 and R2 that correspond to one of the
sensor profiles built in to the SH2165
Pick resistance values for R19 and R20 to set Z axis gain/sensitivity
Set values for the registers in the EEPROM (note that valid values in
the EEPROM override values specified by resistances)
EEPROM sensor registers
Offset
Register
Valid values
0x0FC2
X- and Y-axis gain
0x01-0xFE
0x0FC3
Z-axis gain
0x01-0xFE
0x0FC4
Direction control
0x01-0xFE
Direction control register bits
Bit
Default
Description
7
1
0: select only; 1: select & drag
6
0
0: slow drag enabled; 1: slow drag disabled
5
1
0: Z-tap disabled; 1: slow drag disabled
4
1
Always 1
3
(None)
Z sign: 0: positive; 1: reversed
2
0
XY swap: 0: no swap; 1: swap
1
0
Y sign: 0: positive; 1: reversed
0
X sign: 0: positive; 1: reversed
If the EEPROM is present and valid, and any of these register locations
contains a valid value, the SH2165 uses that value for that register,
regardless of the resistor values for R1, R2, etc.
The SH2165 has built-in profiles to
interface with several sensors; the
user selects a profile by the ratio of
resistor values: B = R2 / (R1 + R2)
where R2 = 100 K
.
1
> B > 5/8: reserved
5/8 > B > 4/8: Alps 3.2 K
R1 = 76.8 K
4/8 > B > 3/8: Elantech 3.2 K
with tail
R1 = 76.8 K
3/8 > B > 2/8: Elantech 3.2 K
without tail
R1 = 220 K
2/8 > B > 1/8: NMB 636
R1 = 431 K
1/8 > B > 0: NMB 350
R1 open
The SH2165 has built-in Z-axis
functionality to recognize click and
double-click on the force stick itself.
Z-axis sensitivity depends on the
values of resistors R19 and R20.
A = R19 / (R19 + R20)
D = default value for Z sensitivity
S = actual value for Z sensitivity
If 1.0 >= A > 0.9:
S = D
If 0.1 > A >= 0.0:
S = 0 (Z disabled)
For other values of A:
S = D * A * 2
Note: Z can also be disabled by
tying ZSENS to GND
The value of resistor R6 should
match the resistance of the sensor.
Z-AXIS GAIN
SENSOR RESISTANCE
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