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参数资料
| 型号： | L9942 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, PDSO36 |
| 封装： | POWER, SO-36 |
| 文件页数： | 6/21页 |
| 文件大小： | 161K |
| 代理商： | L9942 |
TIMER1
The interrupt output of TIMER1 is connected to the level sensitive interrupt input I4 of the core (start ad-
dress FF0h). So the interrupt has to be cleared before the interrupt service routine is left.
The autoreset function is not implemented.
TIMER1 can get its clock signal from two internal and one external sources (see Fig. 6 and 8).
Internal sources (output mode).
In RUN and WAIT mode the timer is supplied with a clock signal derived from main oscillator. Its fre-
quency is fMAINCLK/12. In STOP mode it is supplied with a clock signal derived from standby oscillator
with the frequency fSBCLK/12. Therefore the timer can also be operated in STOP mode. A timer interrupt
can finish STOP mode. The max. timer interval is 12 X 2
15/f. This is 49ms in RUN and WAIT mode for
fMAINCLK = 8MHz and 12s in STOP mode for fSBCLK = 32kHz.
External source (input mode, input gated mode)
The timer input can be connected with I/O port PA2 or oscillator count logic via multiplexer MUX3. This
multiplexer is controlled by bit TEST of oscillator control register OSCR. If this bit is cleared the timer in-
put is connected with PA2 input schmitt trigger. With PA2 configured as input TIMER1 can be operated
in input mode or input gated mode.
If bit TEST of OSCR is set the timer input is connected to output GATE of oscillator count logic. In this
configuration TIMER1 can be operated in input gated mode in order to measure the clock period of RC
oscillator as described above.
There is no output driver available for TIMER1.
WATCHDOG
The ST6WD1 is used to reset the device after a certain period of time if it is not refreshed.
The watchdog is always active and cannot be disabled. In RUN and WAIT mode of the CPU, when the
main oscillator works, the watchdog is supplied with a clock signal with the frequency fMAINCLK /48.
Therefore the period of the watchdog can be programmed in 64 steps from 1.536ms up to 98ms for a
mainclock of 8MHz (see Fig. 5).
In STOP mode of the CPU the watchdog is supplied with a clock signal derived from RC oscillator. It’s
frequency is fSBCLK/48. With fSBCLK = 32.768kHz the period of the watchdog can be programmed in 64
steps from 375ms up to 24 seconds.
After a reset, ST6WD1 is set to it’s longest period (98msec. for fMAINCLK = 8MHz, in RUN and WAIT
mode; 24 sec in STOP mode).
ST6WD1 is able to produce a SW-Reset (bit0 set to ”1”, bit1 to ”0”).
Dataspace address of watchdog register WDT is D8h.
I/O Port
Pins PA0 ... PA3 are of type IOP4.
The polarity of the interrupt output of the port can be selected by bit PAES in Register BPCR.
If this bit is cleared, the I/O interrupt output is not inverted and an interrupt can be generated on falling
edge or low level (depending on bit6 of interrupt option register IOR). If this bit is set, interrupts are gen-
erated on rising edge or high level.
If more then one port pin is programmed as interrupt input, overlapping interrupts may occur. This situ-
ation has to be avoided if edge sensitivity is selected. Otherwise interrupt events might be lost.
Pins PA0 and PA1 may be also used to connect an external line interface circuit with the on-chip CAN
Controller.
Bit BUSIE of the bridge/Port Control Register BPCR (E2H) is used for multiplexing Port A Data Register
bits 0 and 1 with the CAN Module input and output, as shown in Fig. 8.
MICROCONTROLLER SECTION (continued)
L9942
14/21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L9942XP1 | 功能描述:低压差稳压器 - LDO Integrated Stepper Bipolar Motor Driver RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| L9942XP1TR | 功能描述:马达/运动/点火控制器和驱动器 Integrated Stepper Bipolar Motor Driver RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| L9946 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DC Motor Controller/Driver |
| L9947 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER |
| L9947L | 制造商:STMicroelectronics 功能描述: |
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