MAX9924–MAX9927
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
_______________________________________________________________________________________ 7
Pin Description
PIN
MAX9924 MAX9925 MAX9926 MAX9927
NAME FUNCTION
1 1 — — IN+ Noninverting Input
2 2 — — IN- Inverting Input
— 3 — — OUT Amplifier Output
3 — — — N.C. No Connection. Not internally connected.
4 4 — — BIAS
Input Bias. Connect to an external resistor-divider and bypass
to ground with a 0.1µF and 10µF capacitor.
5 5 11 11 GND Ground
6 6 13 — ZERO_EN
Zero-Crossing Enable. Mode configuration pin, internally
pulled up to V
CC
with 10kΩ resistor.
7 7 — — COUT
Comparator Output. Open-drain output, connect a 10kΩ pullup
resistor from COUT to V
PULLUP
.
8 8 — — EXT
External Reference Input. Leave EXT unconnected in Modes
A1, A2. Apply an external voltage in Modes B, C.
9 9 — — INT_THRS Internal Adaptive Threshold. Mode configuration pin.
10 10 14 14 V
CC
Power Supply
— — 1 1 INT_THRS1 Internal Adaptive Threshold 1. Mode configuration pin.
— — 2 2 EXT1
External Reference Input 1. Leave EXT unconnected in Modes
A1, A2. Apply an external voltage in Modes B, C.
— — 3 3 BIAS1
Input Bias 1. Connect to an external resistor-divider and
bypass to ground with a 0.1µF and 10µF capacitor.
— — 4 4 COUT1
Comparator Output 1. Open-drain output, connect a 10kΩ
pullup resistor from COUT1 to V
PULLUP
.
— — 5 5 COUT2
Comparator Output 2. Open-drain output, connect a 10kΩ
pullup resistor from COUT2 to V
PULLUP
.
— — 6 6 BIAS2
Input Bias 2. Connect to an external resistor-divider and
bypass to ground with a 0.1µF and 10µF capacitor.
— — 7 7 EXT2
External Reference Input 2. Leave EXT unconnected in Modes
A1, A2. Apply an external voltage in Modes B, C.
— — 8 8 INT_THRS2 Internal Adaptive Threshold 2. Mode configuration pin.
— — 9 9 IN2+ Noninverting Input 2
— — 10 10 IN2- Inverting Input 2
— — 12 — DIRN
Rotational Direction Output. Open-drain output, connect a
pullup resistor from DIRN to V
PULLUP
.
— — — 12 OUT2 Amplifier Output 2
— — — 13 OUT1 Amplifier Output 1
— — 15 15 IN1- Noninverting Input 1
— — 16 16 IN1+ Inverting Input 1
