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參數(shù)資料
| 型號(hào)： | PIC16C621A |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類(lèi)： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller(8位微控制器) |
| 中文描述： | 8位微控制器（8位微控制器） |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大?。?/td> | 89K |
| 代理商： | PIC16C621A |
PIC16C621A
8-BIT
MICROCONTROLLER
2
PIC16C621A-20/SO
(SSOP)
0.65 mm (0.026”) pitch
RECOMMENDED OPERATING CONDITIONS
over operating temperature range
Logic Supply Voltage Range, V
DD
............... 4.5 V to 5.5 V
High-Level Input Voltage, V
IH
............................
≥
0.85V
DD
Low-level input voltage, V
IL
.................................
≤
0.15V
DD
Dwg. PP-071-1
PFD
A
PHASE
A
PFD
B
PHASE
B
MONITOR OUT
SHIFT CLOCK
SERIAL DATA OUT
STROBE OUT
MODE SELECT
0
DIRECTION
CONTROL IN
OSC/CLOCK IN
OSC/CLOCK OUT
SUPPLY
V
DD
GROUND
MODE SELECT
1
MODE SELECT
2
STEP IN
RESET
9
7
SUPPLY
V
DD
GROUND
19
15
6
1
2
3
4
5
10
14
13
12
11
20
18
17
16
9
8
To ease and simplify the design effort, the user only
provides the following signals: (a) direction, (b) stepping
clock (8x the full-step frequency), (c) mode logic (three
inputs determine the operation for full, half, quarter, or
eighth stepping), (d) reset input (initiates a ‘detent’
position), and (e) recirculation control (this allows estab-
lishing the percent of fast- vs slow-decay in the phase
winding). The microcontroller program providess auto-
matic recirculation control. This eliminates the need for
evaluating the impact of stepping rate vs the sinusoidal
current profile.
Although recirculation control can provide slight
improvements (i.e., lower current ripple, reduced motor
heating [a few degrees], and diminish audible noise levels
[minimal differences]), this entails an evaluation of the
motor (and step frequencies) to determine the proper ratio
of fast- and slow-decay. The benefits of tuning the
recirculation ratios are small, and the time and effort
required can be considerable. Hence, the uninitiated user
should opt for the automatic recirculation control, and
avoid the essentially unnecessary activity.
FUNCTIONAL DESCRIPTION
MICROCONTROLLER OPERATION
Although ‘hardware’ control of the microstepping ICs
is feasible, without a specific (ASIC), monolithic IC
controller the prime solution becomes a ‘software’ option.
From the user’s perspective, a ‘preprogrammed’ micro-
controller appears little, or no, different than a ‘dedicated’
controller and sequencer IC expressly created for mi-
crostepping applications of the power-driver ICs. Further,
the flexibility of a software-based drive is certainly a basic
benefit (high-volume production of 8-bit microcontrollers
transposes to low-cost circuitry).
As an indicator of the logic signals needed to control
the power ICs, Table 1 lists the required A3955 inputs to
the 3-bit DAC for eighth-step operation (the similar
A3957 uses a 4-bit DAC for sixteenth-step operation).
These I/O signals are serial data from the microcontroller,
then converted to a parallel mode by a 74HC595 as the
‘interface’ between the microcontroller and the two
microstepping power ICs.
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參數(shù)描述 |
|---|---|
| PIC16C621A/JW | 功能描述:8位微控制器 -MCU 1.75KB 96 RAM 13 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C621A-04/P | 功能描述:8位微控制器 -MCU 1.75KB 96 RAM 13 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C621A-04/P | 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C621 DIP18 |
| PIC16C621A-04/SO | 功能描述:8位微控制器 -MCU 1.75KB 96 RAM 13 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16C621A-04/SS | 功能描述:8位微控制器 -MCU 1.75KB 96 RAM 13 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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