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參數(shù)資料
| 型號： | MCZ33976EG |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Dual Gauge Driver with Configurable esponse Time |
| 中文描述： | 雙計驅(qū)動器，可配置esponse時間 |
| 文件頁數(shù)： | 19/41頁 |
| 文件大?。?/td> | 551K |
| 代理商： | MCZ33976EG |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
19
33976
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Address 110 — Ramp Selection Register (RMPSELR)
SI Address 110 Ramp Selection Register (RMPSELR)
(refer to
Table 15
, page
20
). A write to the 33976 using this
register allows the master to independently modify the
pointer movement response characteristics of each gauge
driver. The user has three variables that can be configured,
during the initialization of the device, to provide quick and
responsive pointers (e.g., tachometer applications) or soft
landing and less responsive pointers (e.g., speedometer or
fuel indicators). These three variables are (1) the ramp zero
selection RS (RS3:RS0), (2) the hold count cut-in location
offset variable HCP (HCP2: HCP0), and (3) the hold count
value HC, (HC3:HC0). Each of these variables is described
below and an implementation example is shown in
Figure 11
,
page
31
.
The state machine uses the velocity ramp (refer to
Table 30
, page
28
) to control the acceleration, deceleration
and speed of the pointer movement. During an acceleration
from a stopped position, the state machine will microstep the
pointer at each velocity step, starting with step 0, in
succession until the desired pointer speed is reached.
Similarly, as the pointer approaches the commanded
position, the state machine will microstep the motor at
successive velocity steps down the velocity ramp until
reaching step 0. The fastest that a pointer can accelerate,
decelerate or change directions is limited by the velocity
ramp.
For example, if a pointer is moving in the clockwise
direction and is commanded to a position that is counter
clockwise from the current pointer location, then the state
machine must first decelerate the pointer down the ramp to
the step 0 location, change directions and then accelerate up
the ramp towards the commanded location. In this situation,
the state machine will force movement down and then up the
ramp as fast as possible by stepping at each Velocity Position
only once for a direction change. The low velocity steps (e.g.,
Velocity Position 1 is 27 ms) are significant in that they can
limit the speed with which a pointer can change direction.
Bits RS3:RS0 of the RMPSELR are used to truncate as
many as 15 velocity steps off of the bottom of the velocity
ramp. The value of RS determines the Initial Velocity Ramp
Position:
Initial Velocity Position = RS + 1
For example, writing a value of 4 to these bits truncates the
velocity ramp by 4 and would result in a first and last velocity
step of 5.86ms (Velocity Position 5). A pointer will change
directions much faster with this abbreviated ramp than it
would if using the default ramp with a Velocity Position 1 of
27 ms
Most applications require a smooth dynamic pointer as the
commanded position is constantly updated. Movement along
the ramp at the maximum acceleration and deceleration (only
one step at each velocity position) results in a choppy
movement because the movement velocity range is large for
small changes in position as the pointer quickly reaches
commanded locations from command to command.
Configuring the state machine to repeat velocity steps at
several of the last few step locations, when the pointer
decelerates to the commanded location, can eliminate this
choppy movement. These repetitive steps are referred to as
hold counts.
Bits HCP2: HCP0 of the RMPSELR determine the velocity
step location at which the hold counts begin during a
deceleration to the commanded position. The value written to
HCP2: HCP0 (HCP) is multiplied by 8 and added to the RS
value. The result is the first velocity position, or the Hold
Count Cut-In Point, to which the hold counts will apply during
a deceleration.
First Velocity Position w/ Hold Counts = HCP x 8 + RS
The exception to this is when the HCP2: HCP0 value is
000. In this case, HCP = 8 and the cut-in point will be 64 steps
above the RS value. The default value of the HCP = 2 or a
hold count cut-in point of 16 velocity steps above the RS
value.
Table 14. RTZCR Accumulator Offset
RC10
RC9
RC8
RC7
RC6
RC5
Preload Value
(PV)
Initial Accumulator
Value = (-16 x PV) -1
0
0
0
0
0
0
0
-1
0
0
0
0
0
1
1
-17
0
0
0
0
1
0
2
-33
0
0
0
0
1
1
3
-49
0
0
0
1
0
0
4
-65
.
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.
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1
1
1
1
1
1
63
-1009
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCZ33976EG | 制造商:Freescale Semiconductor 功能描述:IC STEPPER MOTOR GUAGE DRIVER SPI |
| MCZ33976EG/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Dual Gauge Driver with Configurable Response Time |
| MCZ33976EGR2 | 功能描述:功率驅(qū)動器IC CONFIG DUAL GAUGE DR RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MCZ33977EG | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 SINGLE GAUGE DR. LG PTR RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| MCZ33977EG | 制造商:Freescale Semiconductor 功能描述:IC STEPPER MOTOR GAUGE DRIVER SPI |
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