A1337 datasheet(8/37 Pages) ALLEGRO

8 / 37 page

Precision, Hall-Effect Angle Sensor IC

with SPI, and SENT or PWM Outputs

A1337

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Characteristics

Symbol

Test Conditions

Min.

Typ. [1]

Max.

Unit[2]

PWM INTERFACE SPECIFICATIONS (A1337LLETR-P-DD-T and A1337LLETR-P-T variants only)

PWM Carrier Frequency

fPWM

PWM Frequency Code = 00

–

122

–

PWM Frequency Code = 01

–

1.024

–

kHz

PWM Frequency Code = 10

–

2.048

–

kHz

PWM Duty Cycle Minimum

DPWM(min)

–

PWM Duty Cycle Maximum

DPWM(max)

–

PWM Output Signal [7]

VPWM(L)

5 kΩ ≤ Rpullup ≤ 50 kΩ

–

0.2

2 kΩ ≤ Rpullup < 5 kΩ

–

0.4

VPWM(H)

Minimum Rpullup = 2 kΩ

0.9 × VS

–

Maximum Rpullup = 50 kΩ

0.7 × VS

–

Maximum Sink Current

ILIMIT

Output FET on, TA = 25°C

–

PWM Carrier Frequency Tolerance [7]

–

Deviation from expected fPWM

–10

–

PWM Resolution

–

12-bit angle value

0.022

–

%DC/LSB

PWM Frequency Jitter

fPWM(JITTER)

1σ, TA = 25°C, fPWM = 2 kHz

0.18

–

1σ, TA = 25°C, fPWM = 1 kHz

0.11

–

1σ, TA = 25°C, fPWM = 124 Hz

0.01

–

PWM Duty Cycle Jitter

DPWM(JITTER)

3σ, 300 G, TA = 25°C, no AVG

0.095

–

%DC

3σ, 300 G, fPWM = 2 kHz, AVG = 0x4 or greater

0.095

–

%DC

3σ, 300 G, fPWM = 1 kHz, AVG = 0x5 or greater

0.03

–

%DC

3σ, 300 G, fPWM = 124 Hz, AVG = 0x7

0.027

–

%DC

PWM Thermal Duty Cycle Drift [7]

DPWM(THDRIFT) Change in duty cycle from 25°C to 150°C; 300 G

–0.35

–

0.35

%DC

SENT PROTOCOL SPECIFICATIONS (A1337LLETR-DD-T and A1337LLETR-T variants only)

SENT Message Duration

tSENT

Tick time = 3 µs

–

Minimum Programmable SENT

Message Duration

tSENTMIN

Tick time = 0.5 µs, 3 data nibbles, SCN, and CRC,

nibble length = 27 ticks

–

µs

SENT Output Signal

VSENT(L)

5 kΩ ≤ Rpullup ≤ 50 kΩ

–

0.2

2 kΩ ≤ Rpullup < 5 kΩ

–

0.4

VSENT(H)

Minimum Rpullup = 2 kΩ

0.9 × VS

–

Maximum Rpullup = 50 kΩ

0.7 × VS

–

SENT Output Trigger Signal

VSENTtrig(L)

–

1.4

VSENTtrig(H)

2.8

–

Minimum Time Frame for SENT

Trigger Signal

tSENTMIN

Tick time = 0.5 µs, 3 data nibbles, SCN, and CRC,

nibble length = 27 ticks

–

µs

Triggered Delay Time

tdSENT

From end of trigger pulse to beginning of SENT

message frame.

TSENT (SENT_MODE 3 and SENT_MODE 4)

–

tick

Maximum Sink Current

ILIMIT

Output FET on, TA = 25°C

–

Continued on the next page…

OPERATING CHARACTERISTICS (continued): Valid over the full operating voltage and ambient temperature ranges,

unless otherwise noted

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