L6474 Datasheet, PDF (15/51 Pages) STMicroelectronics – easySPIN – fully integrated microstepping motor driver

L6474
Pin connection
4.1
Pin list
Table 6. Pin description
N.
Name
Type
Function
17
VDD
Power
Logic outputs supply voltage (pull-up reference)
6
VREG
7
OSCIN
Power
Analog input
Internal 3 V voltage regulator output and 3.3 V external logic
supply
Oscillator pin 1. To connect an external oscillator or clock source.
If this pin is unused, it should be left floating.
Oscillator pin 2. To connect an external oscillator. When the
8
OSCOUT
Analog output internal oscillator is used this pin can supply 2/4/8/16 MHz. If this
pin is unused, it should be left floating.
10
CP
Output
Charge pump oscillator output
11
VBOOT
Supply voltage
Bootstrap voltage needed for driving the high side power DMOS of
both bridges (A and B)
5
ADCIN
Analog input Internal analog to digital converter input
2
VSA
26
Power supply Full bridge A power supply pin. It must be connected to VSB
12
VSB
16
Power supply Full bridge B power supply pin. It must be connected to VSA
27
PGND
13
Ground
Power ground pin
1
OUT1A
Power output Full bridge A output 1
28
OUT2A
14
OUT1B
Power output
Power output
Full bridge A output 2
Full bridge B output 1
15
OUT2B
Power output Full bridge B output 2
9
AGND
Ground
Analog ground
4
DIR
21
DGND
Logical input
Ground
Direction input
Digital ground
22
SYNC
Open drain output Synchronization signal.
18
SDO
Logic output Data output pin for serial interface
20
SDI
Logic input
Data input pin for serial interface
19
CK
23
CS
Logic input
Logic input
Serial interface clock
Chip select input pin for serial interface
Status flag pin. An internal open drain transistor can pull the pin to
24
FLAG
Open drain output
GND when a programmed alarm condition occurs (step loss,
OCD, thermal pre-warning or shutdown, UVLO, wrong command,
non performable command)
3
STBY\RST
Logic input
Standby and reset pin. LOW logic level resets the logic and puts
the device into standby mode. If not used, should be connected to
VDD
Doc ID 022529 Rev 2
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