5 Pin Configuration and Functions

Figure 5-1 PWP Package28-Pin HTSSOPTop View

Figure 5-2 RHD Package28-Pin VQFNTop View

Table 5-1 Pin Functions

PIN			I/O⁽¹⁾	DESCRIPTION	EXTERNAL COMPONENTS OR CONNECTIONS
NAME	PWP	RHD	I/O⁽¹⁾	DESCRIPTION	EXTERNAL COMPONENTS OR CONNECTIONS
POWER AND GROUND
GND	14, 28	3, 17	—	Device ground
VMA	4	7	—	Bridge A power supply	Connect to motor supply (8.2 to 45 V). Both pins must be connected to same supply, bypassed with a 0.1-μF capacitor to GND, and connected to appropriate bulk capacitance.
VMB	11	14	—	Bridge B power supply
V3P3OUT	15	18	O	3.3-V regulator output	Bypass to GND with a 0.47-μF 6.3-V ceramic capacitor. Can be used to supply VREF.
CP1	1	4	IO	Charge pump flying capacitor	Connect a 0.01-μF 50-V capacitor between CP1 and CP2.
CP2	2	5	IO	Charge pump flying capacitor	Connect a 0.01-μF 50-V capacitor between CP1 and CP2.
VCP	3	6	IO	High-side gate drive voltage	Connect a 0.1-μF 16-V ceramic capacitor. A 1-MΩ resistor can be connected to VM to accelerate discharge of the VCP capacitor.
CONTROL
nENBL	21	24	I	Enable input	Logic high to disable device outputs and indexer operation, logic low to enable. Internal pulldown.
nSLEEP	17	20	I	Sleep mode input	Logic high to enable device, logic low to enter low-power sleep mode. Internal pulldown.
STEP	22	25	I	Step input	Rising edge causes the indexer to move one step. Internal pulldown.
DIR	20	23	I	Direction input	Level sets the direction of stepping. Internal pulldown.
MODE0	24	27	I	Microstep mode 0	MODE0 through MODE2 set the step mode: full, 1/2, 1/4, 1/8/ 1/16, or 1/32 step. Internal pulldown.
MODE1	25	28	I	Microstep mode 1
MODE2	26	1	I	Microstep mode 2
DECAY	19	22	I	Decay mode	Low = slow decay, Open = mixed decay, High = fast decay. Internal pulldown and pullup.
nRESET	16	19	I	Reset input	Active-low reset input initializes the indexer logic and disables the H-bridge outputs. Internal pulldown.
AVREF	12	15	I	Bridge A current set reference input	Reference voltage for winding current set. Normally AVREF and BVREF are connected to the same voltage. Can be connected to V3P3OUT.
BVREF	13	16	I	Bridge B current set reference input
NC	23	26	—	No connect	Leave this pin unconnected.
STATUS
nHOME	27	2	OD	Home position	Logic low when at home state of step table
nFAULT	18	21	OD	Fault	Logic low when in fault condition (overtemperature, overcurrent)
OUTPUT
ISENA	6	9	IO	Bridge A ground / Isense	Connect to current sense resistor for bridge A.
ISENB	9	12	IO	Bridge B ground / Isense	Connect to current sense resistor for bridge B.
AOUT1	5	8	O	Bridge A output 1	Connect to bipolar stepper motor winding A. Positive current is AOUT1 → AOUT2
AOUT2	7	10	O	Bridge A output 2
BOUT1	10	13	O	Bridge B output 1	Connect to bipolar stepper motor winding B. Positive current is BOUT1 → BOUT2
BOUT2	8	11	O	Bridge B output 2

(1) Directions: I = input, O = output, OD = open-drain output, IO = input/output