ST7MC2N6 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7MC2N6

8-bit MCU with nested interrupts, Flash, 10-bit ADC, brushless motor control, five timers, SPI, LINSCI™

STMicroelectronics 

ST7MC1xx/ST7MC2xx

MOTOR CONTROL CHARACTERISTICS (Cont’d)

Figure 154. Example 5: Waveforms for sensor HST update timing diagram for a newly selected

phase input

fmtc = 2 x fcpu

fSCF

write IS[1:0] = 01

Sampling time

MCIx

d

Comparator

output

sample

HST (MCRC)

IS[1:0] (MPHST)

XX

01

Sampling of sensor input is done at fSCF, so after writing IS[1:0] in the MPHST register

for input selection, you have to wait:

1) 1/fmtc to resynchronize the data and set the MCIx bit

2) 100ns corresponding to the comparator & multiplexer propagation delay (d)

3) 1/fSCF to sample the comparator output

4) 1/fmtc to resynchronize the data and set the HST bit

Example with fPERIPH = fmtc = 4MHz :

SCF[1:0]

00

01

10 11

fSCF

1MHz 500kHz 250kHz 125kHz

Secure

waiting

time

2µs 3µs 5µs 9µs

to read HST

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