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AS5040
Data Sheet
Table 2 Pin Description SSOP16
Pin
1
2
3
Symbol
MagINCn
MagDECn
A_LSB_U
Type
DO_OD
DO_OD
DO
Description
Magnet Field Mag nitude INC rease; active low, indicates a distance
reduction between the magnet and the device surface.
Magnet Field Mag nitude DEC rease; active low, indicates a distance
increase between the device and the magnet.
Mode1.x: Quadrature A channel
Mode2.x: L east S ignificant B it
Mode3.x: U signal (phase1)
4
Mode1.x : Quadrature B channel quarter period shift to channel A.
B_Dir_V
DO
Mode2.x: Dir ection of Rotation
Mode3.x: V signal (phase2)
5
6
7
8
NC
Index_W
VSS
Prog
-
DO
S
DI_PD
Must be left unconnected
Mode1.x and Mode2.x : Index signal indicates the absolute zero position
Mode3.x : W signal (phase3)
Negative Supply Voltage (GND)
OTP Prog ramming Input and Data Input for Daisy Chain mode. Internal
pull-down resistor (~74k Ω ).
May be connected to VSS if programming is not used
9
10
11
12
13
14
15
16
DO
CLK
CSn
PWM_LSB
NC
NC
VDD3V3
VDD5V
DO_T
DI, ST
DI_PU, ST
DO
-
-
S
S
D ata O utput of Synchronous Serial Interface
Cl oc k Input of Synchronous Serial Interface; Schmitt-Trigger input
C hip S elect, active low; Schmitt-Trigger input, internal pull-up resistor
(~50k Ω ) connect to VSS in incremental mode (see 0)
P ulse W idth M odulation of approx. 1kHz; LSB in Mode3.x
Must be left unconnected
Must be left unconnected
3V-Regulator Output (see Figure 19)
Positive Supply Voltage 5 V
DO_OD
DO
DI_PD
DI_PU
digital
digital
digital
digital
output open drain
output
input pull-down
input pull-up
S
DI
DO_T
ST
supply pin
digital input
digital output /tri-state
Schmitt-Trigger input
Mode 3.x: Brushless DC Motor Commutation Mode
In addition to the absolute encoder output over the SSI interface, this mode provides commutation signals for
brushless DC motors with either one pole pair or two pole pair rotors. The commutation signals are usually provided
by 3 discrete Hall switches, which are no longer required, as the AS5040 can fulfill two tasks in parallel: absolute
encoder + BLDC motor commutation.
In this mode, pin 12 provides the LSB output instead of the PWM (Pulse-Width-Modulation) signal.
Pin 8 (Prog) is also used to program the different incremental interface modes, the incremental resolution and the
zero position into the OTP (see page 18).
This pin is also used as digital input to shift serial data through the device in Daisy Chain configuration,
(see page 11).
Pin 11 Chip Select (CSn; active low) selects a device within a network of AS5040 encoders and initiates serial data
transfer. A logic high at CSn puts the data output pin (DO) to tri-state and terminates serial data transfer. This pin is
also used for alignment mode (page 21) and programming mode (page 16).
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