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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)： | 30/41頁 |
| 文件大小： | 551K |
| 代理商： | MCZ33976EG |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
30
33976
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Internal Clock Calibration
Timing-related functions on the 33976 (e.g., pointer
velocities, acceleration, and Return To Zero Pointer speeds)
depend upon a precise, consistent time reference to control
the pointer accurately and reliably. Generating accurate time
references on an integrated circuit can be accomplished. For
example trimming can be used however, it tends to be costly
due to the large amount of die area required for trim pads.
Another possibility is an externally generated clock signal;
however, this requires a dedicated pin on the device and
controller. An alternate approach would require the use of an
additional crystal or resonator, which is expensive.
The internal clock in the 33976 is temperature
independent and area efficient; however, it can vary by as
much as ±35 percent due to process variation. Using the
existing SPI inputs and the precision timing reference already
available to the microcontroller, the 33976 allows more
accurate clock calibration to within ±10 percent.
Calibrating the internal 1.0 MHz clock is initiated by writing
a logic [1] to PECCR bit PE3 (see
Figure 10
, page
30
). The
8.0
μ
s calibration pulse is then provided by the controller to
ideally result in an internal 33976 clock speed of 1.0 MHz.
The pulse is sent on the
CS
pin immediately after the SPI
word is sent. During the calibration, no other SPI lines should
be toggled. At the moment the
CS
pin transitions from
logic [1] to logic [0], an internal 7-bit counter counts the
number of cycles of an internal, 8.0 MHz clock. The counter
stops when the
CS
pin transitions from logic [0] to logic [1].
The value in the counter represents the number of cycles of
the 8.0 MHz clock occurring in the 8.0
μ
s window; it should
range from 32 to 119. An offset is added to this number to
help center or skew the calibrated result to generate a
desired maximum or nominal frequency. The modified
counter value is truncated by 4 bits to generate the calibration
divisor, which should range from 4 to 15. The 8.0 MHz clock
is divided by the calibration divisor, resulting in a calibrated
1.0 MHz clock. If the calibration divisor lies outside the range
of 4 to 15, the 33976 flags the CAL bit in the device status
register, indicating the calibration procedure was not
successful. A clock calibration is allowed only if the gauges
are disabled or the pointers are not moving, as indicated by
status bits MOV1 and MOV0 (
Table 20
, page
21
).
Figure 10. Gauge Enable and Clock Calibration Example
66
414
2415.5
142
267
3745.3
218
212
4717.0
67
410
2439.0
143
266
3759.4
219
211
4739.3
68
406
2463.1
144
265
3773.6
220
211
4739.3
69
403
2481.4
145
264
3787.9
221
210
4761.9
70
399
2506.3
146
263
3802.3
222
210
4761.9
71
396
2525.3
147
262
3816.8
223
209
4784.7
72
393
2544.5
148
261
3831.4
224
209
4784.7
73
389
2570.7
149
260
3846.2
225
208
4807.7
74
386
2590.7
150
259
3861.0
75
383
2611.0
151
258
3876.0
Table 30. Velocity Table (continued)
Velocity
Position
Time
Between
Steps (
μ
s)
Velocity
(
μ
Steps/s)
Velocity
Position
Time
Between
Steps (
μ
s)
Velocity
(
μ
Steps/s)
Velocity
Position
Time
Between
Steps (
μ
s)
Velocity
(
μ
Steps/s)
D15
SI
SCLK
CS
PECCR Command
D0
8.0
μ
s Calibration Pulse
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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(yùn)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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