STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Data Sheet
Product codes
EVAL6460
L6460
Start-up configurations
Doc ID 17713 Rev 1
39/139
8 Start-up
configurations
L6460 start-up configuration is selected by setting in different states the GPIO[0], GPIO[3]
and GPIO[4] pins. Each of these is a three state input pin and is able to distinguish among
the following situations:
and GPIO[4] pins. Each of these is a three state input pin and is able to distinguish among
the following situations:
Note:
“Shorted” means: R
≤
1KOhm; “Z” means: R
≥
10KOhm, C
≤
200pF
8.1 Operation
modes
When V
Supply
voltage is applied to L6460, the internal regulator V3v3, used to supply the
logic circuits inside the device, starts its functionality. When it reaches its final value, L6460
enables the GPIO[0] pin state read circuitry, and, after a time TpinSample, it will sample the
GPIO[0] state. If it is found to be in high impedance, L6460 does not consider GPIO[3] and
GPIO[4] pins state and starts its “Basic device” mode sequence. If GPIO[0] is found to be
connected to ground or to V3v3, L6460 checks the state of GPIO[3] and GPIO[4] pins to
select its start-up configuration.
enables the GPIO[0] pin state read circuitry, and, after a time TpinSample, it will sample the
GPIO[0] state. If it is found to be in high impedance, L6460 does not consider GPIO[3] and
GPIO[4] pins state and starts its “Basic device” mode sequence. If GPIO[0] is found to be
connected to ground or to V3v3, L6460 checks the state of GPIO[3] and GPIO[4] pins to
select its start-up configuration.
The possible configurations can be classified in four “Major” modes:
1.
Basic device.
2. Slave
device.
3. Master
device.
4. Single
device.
Hereafter is reported the correspondence table between GPIO[X] state and L6460
configurations.
configurations.
Table 8.
Possible start-up pins state symbol
Pin condition
State symbol
Shorted to ground
0
Shorted to V
3v3
pin
1
Floating
Z