CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
1. Absolute linearity is utilized to determine actual wiper resistance versus expected resistance = (R
H(n)
(actual)-R
H(n)
(expected)) = ±1 Ml Maximum.
n = 1 .. 29 only
2. Relative linearity is a measure of the error in step size between taps = R
H(n+1)
—[R
H(n)
+ Ml] = ±0.5 Ml, n = 1 .. 29 only.
3. 1 Ml = Minimum Increment = R
TOT
/31.
4. Typical values are for T
A
= +25°C and nominal supply voltage.
5. Limits established by characterization and are not production tested.
6. When performing multiple write operations, V
CC
must not decrease by more than 150mV from its initial value.
7. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
Potentiometer Specifications
SYMBOL
R
TOT
V
R
Over recommended operating conditions, unless otherwise stated.
TEST CONDITIONS/NOTES
MIN
(Note 7)
37.5
0
R
TOTAL
=50kΩ
Ref: 1kHz
(Note 5)
3
R
H(n)(actual)
-R
H(n)(expected)
R
H(n+1)
-[R
H(n)+MI
]
(Note 5)
See “Circuit #2 SPICE Macro
Model” on page 4
±35
10/10/25
±1
±0.5
-120
0.6
TYP
(Note 4)
50
MAX
(Note 7)
62.5
V
CC
1
UNIT
kΩ
V
mW
(Note 5)
dBV
(Note 5)
mA
%
MI
(Note 3)
MI
(Note 3)
ppm/°C
pF
(Note 5)
PARAMETER
End-to-end Resistance
R
H
, R
L
Terminal Voltages
Power Rating
Noise
I
R
Potentiometer Current
Resolution
Absolute linearity (Note 1)
Relative linearity (Note 2)
R
TOTAL
Temperature Coefficient
C
H
/C
L
/C
W
Potentiometer Capacitances
DC Electrical Specifications
SYMBOL
I
CC1
I
CC2
I
SB
I
LI
Over recommended operating conditions unless otherwise specified.
TEST CONDITIONS
CS = V
IL
, U/D = V
IL
or V
IH
and
INC = 0.4V @ max. t
CYC
CS = V
IH
, U/D = V
IL
or V
IH
and
INC = V
IH
@ max. t
WR
CS = V
CC
- 0.3V, U/D and INC = V
SS
or V
CC
- 0.3V
V
CS
= V
CC
MIN
(Note 7)
TYP
(Note 4)
200
MAX
(Note 7)
300
1400
2.0
±1
UNIT
µA
µA
µA
µA
PARAMETER
VCC Active Current (Increment)
VCC Active Current (Store)
(EEPROM Store)
Standby Supply Current
CS
3
FN8181.2
February 19, 2008
X93155
DC Electrical Specifications
SYMBOL
I
LI
I
LI
V
IH
V
IL
C
IN
(Note 5)
CS
INC, U/D Input Leakage Current
CS, INC, U/D Input HIGH Voltage
CS, INC, U/D Input LOW Voltage
CS, INC, U/D Input Capacitance
V
CC
= 5V, V
IN
= V
SS
, T
A
= +25°C,
f = 1MHz
Over recommended operating conditions unless otherwise specified.
(Continued)
TEST CONDITIONS
V
CC
= 5V, CS = 0
V
IN
= V
SS
to V
CC
V
CC
x 0.7
-0.5
MIN
(Note 7)
120
TYP
(Note 4)
200
MAX
(Note 7)
250
±1
V
CC
+ 0.5
V
CC
x 0.1
10
UNIT
µA
µA
V
V
pF
PARAMETER
Endurance and Data Retention
PARAMETER
Minimum endurance
Data retention
MIN
200,000
100
UNIT
Data changes per bit
Years
Circuit #2 SPICE Macro Model
R
TOTAL
R
H
C
H
C
W
25pF
C
L
10pF
R
L
Test Circuit #1
TEST POINT
V
H
/R
H
10pF
AC Conditions of Test
V
L
Input pulse levels
Input rise and fall times
Input reference levels
0V to 5V
10ns
1.5V
AC Electrical Specifications
SYMBOL
t
Cl
t
lD
t
DI
t
lL
t
lH
t
lC
t
CPH
t
CPH
t
CYC
t
R
, t
F
(Note 5)
t
R
V
CC
(Note 5)
t
WR
CS to INC Setup
Over recommended operating conditions, unless otherwise specified.
PARAMETER
MIN
(Note 7)
100
100
100
1
1
1
250
10
2
500
1
5
50
10
TYP
(Note 4)
MAX
(Note 7)
UNIT
ns
ns
ns
µs
µs
µs
ns
ms
µs
µs
V/ms
ms
INC HIGH to U/D Change
U/D to INC Setup
INC LOW Period
INC HIGH Period
INC Inactive to CS Inactive
CS Deselect Time (No Store)
CS Deselect Time (Store)
INC Cycle Time
INC Input Rise and Fall time
VCC Power-up Rate
Store Cycle
4
FN8181.2
February 19, 2008
X93155
AC Timing
CS
t
CYC
t
CI
INC
t
IL
t
IH
t
IC
(STORE)
t
CPH
90%
10%
90%
t
ID
t
DI
t
F
t
R
U/D
Power-up and Power-down Requirements
There are no restrictions on the power-up or power-down
conditions of V
CC
and the voltages applied to the
potentiometer pins provided that V
CC
is always more
positive than or equal to V
H
and V
L
, i.e., V
CC
≥
V
H,
V
L
. The
V
CC
ramp rate specification is always in effect.
Pin Descriptions
R
H
and R
L
The R
H
and R
L
pins of the X93155 are equivalent to the end
terminals of a variable resistor. The minimum voltage is V
SS
and the maximum is V
CC
. The terminology of R
H
and R
L
references the relative position of the terminal in relation to
wiper movement direction selected by the U/D input.
resistor array to the wiper output. Under the proper
conditions the contents of the counter can be stored in
nonvolatile memory and retained for future use. The resistor
array is comprised of 31 individual resistors connected in
series. At either end of the array and between each resistor
is an electronic switch that transfers the connection at that
point to the wiper. The wiper is connected to the R
L
terminal,
forming a variable resistor from R
H
to R
L
.
The wiper, when at either fixed terminal, acts like its
mechanical equivalent and does not move beyond the last
position. That is, the counter does not wrap around when
clocked to either extreme.
If the wiper is moved several positions, multiple taps are
connected to the wiper for up to 10µs. The 2-terminal
resistance value for the device can temporarily change by a
significant amount if the wiper is moved several positions.
When the device is powered-down, the last wiper position
stored will be maintained in the nonvolatile memory. When
power is restored, the contents of the memory are recalled
and the wiper is set to the value last stored.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is incremented or decremented.
Increment (INC)
The INC input is negative-edge triggered. Toggling INC will
move the wiper and either increment or decrement the
counter in the direction indicated by the logic level on the
U/D input.
Instructions and Programming
The INC, U/D and CS inputs control the movement of the
wiper along the resistor array. With CS set LOW, the device
is selected and enabled to respond to the U/D and INC
inputs. HIGH to LOW transitions on INC will increment or
decrement (depending on the state of the U/D input) a five
bit counter. The output of this counter is decoded to select
one of thirty two wiper positions along the resistive array.
The value of the counter is stored in nonvolatile memory
whenever CS transitions HIGH while the INC input is also
HIGH. In order to avoid an accidental store during power-up,
CS must go HIGH with V
CC
during initial power-up. When
left open, the CS pin is internally pulled up to V
CC
by an
internal 30kΩ resistor.
The system may select the X93155, move the wiper and
deselect the device without having to store the latest wiper
Chip Select (CS)
The device is selected when the CS input is LOW. The
current counter value is stored in nonvolatile memory when
CS is returned HIGH while the INC input is also HIGH. After
the store operation is complete, the X93155 will be placed in
the low power standby mode until the device is selected
once again.
Principles of Operation
There are three sections of the X93155: the input control,
counter and decode section; the nonvolatile memory; and
the resistor array. The input control section operates just like
an up/down counter. The output of this counter is decoded to
turn on a single electronic switch connecting a point on the
EtherCAT（Ethernet for Control Automation Technology）是一种基于以太网的开发构架的实时工业现场总线通讯协议，EtherCAT是最快的工业以太网技术之一，同时它提供纳秒级精确同步。相对于设置了相同循环时间的其他总线系统，EtherCAT系统结构通常能减少25%-30%的CPU负载，EtherCAT的出现为系统的实时性能和拓扑的灵活性树立了新的标准。...[详细]
1. Introduction
Electronic scales are gradually replacing traditional measuring tools like springs and balances in everyday life, such as electronic price computing scales and electronic weigh...[详细]
SMT贴片机是表面贴装技术（Surface Mount Technology）中的重要设备，它的性能状态对电子制造的质量和效率有着决定性的影响。因此，对SMT贴片机的主要指标性能进行定期检测非常重要。以下是一些主要的检测项目： 定位精度：定位精度是SMT贴片机的核心性能指标，它直接影响到贴片的准确性。通常，我们通过重复测量贴片机在X、Y轴上的移动误差来检测其定位精度。 贴片速度：贴片速度...[详细]
51单片机
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
