CT85x Series
Bipolar Digital TMR Latch
for Consumer
& Industrial Applications
Product Description
The CT85x Series of integrated bipolar magnetic latches and analog sensor are
designed for consumer and industrial switching applications. It is based on Cro-
cus Technology’s patented Magnetic Logic Unit™ (MLU™) technology with inte-
grated CMOS process to provide a monolithic solution for superior sensing per-
formance.
SOT-23 Package
These devices are capable of handling large air gap applications with low mag-
netic fields down to 1.0 mT with best in class high frequency performance. The
CT85x is offered in active-low push-pull CMOS and it can also be configured in
open drain configuration for design flexibility. The latches are available in a 3-
lead SOT-23 packages, providing cost effective and space-saving solutions for
high volume manufacturing. Please contact factory for custom solutions.
Features and Benefits
•
High sensitivity, B
OP
as low as 1.0 mT
Application Examples
•
IoT devices
•
•
•
•
Resistant to mechanical stress
Digital CMOS push-pull with option for open drain
output
Low profile and small form factor packaging
RoHS Compliant
•
•
•
•
•
Smartphones, tablets, and laptops
Door or lid closure detection
Reed switch replacement
Motor controllers
Power switch or open-close detection
2018 Crocus Technology
Document Number CT85x Series Datasheet Rev 1.0
Page 1
CT85x Series
Bipolar Digital TMR Latch
for Consumer
& Industrial Applications
Figure 1: CT85x Block Diagrams
CT852 (SOT23 Package) Block Diagram
VDD
1
MLU
Analog
Front-End
State
Machine
Push-pull
Output
2
OUT
UVLO
Biases
Oscillator
3
GND
2018 Crocus Technology
Document Number CT85x Series Datasheet Rev 1.0
Page 2
CT85x Series
Bipolar Digital TMR Latch
for Consumer
& Industrial Applications
Figure 2: Package Pin-out with Axis of Sensitivity Diagrams
GND
B+
B-
Axis of Sensitivity
VDD
OUT
SOT-23 Package for
CT852
Table 1: Pin-out Information
Pin # for SOT23
Package
1
2
3
Pin Name
VDD
OUT
GND
Pin Description
Supply Voltage
Output Signal (Active LOW) for CT852.
Ground
2018 Crocus Technology
Document Number CT85x Series Datasheet Rev 1.0
Page 3
CT85x Series
Bipolar Digital TMR Latch
for Consumer
& Industrial Applications
Table 2: Absolute Maximum Ratings
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute maximum rated
conditions for extended periods may affect device reliability.
Parameter
Supply Voltage
Push-pull Output (Active LOW)
Input and Output Current
Junction temperature
Storage temperature
Soldering temperature
ESD Level, Human Body Model per JESD22-A114
Symbol
V
DD
V
OUT_PP
I
IN
/ I
OUT
T
J
T
STG
T
SOL
V
ESD_HBM
Min
-0.3
-0.3
-10
-40
-65
Max
4.0
V
DD
+ 0.3
+10
+125
+150
+260
Unit
V
V
mA
°C
°C
°C
kV
±4.0
Table 3: Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for the actual device operation. Recommend-
ed operating conditions are specified to ensure optimal performance to the data sheet specifications. Crocus Tech-
nology does not recommend exceeding them or designing to absolute maximum ratings.
Parameter
Supply Voltage
Output Voltage
Operating Magnetic Flux
Ambient Temperature
Junction Temperature
Symbol Conditions
V
DD
V
OUT
B
T
A
T
J
Min
2.7
Typ
3.0
Max
3.6
3.6
12
Unit
V
V
mT
°C
°C
-40
-40
+25
+125
+125
Table 4: Thermal Properties
Junction-to-ambient thermal resistance is a function of application and board layout and is determined in accord-
ance to JEDEC standard JESD51 for a four (4) layer 2s2p FR-4 printed circuit board (PCB). Special attention must
be paid not to exceed junction temperature T
J(MAX)
at a given ambient temperature.
Parameter
Junction-to-Ambient Thermal Resistance for SOT23 Package
Symbol
JA(SOT23)
Min
Typ
202
Max
Unit
°C/W
2018 Crocus Technology
Document Number CT85x Series Datasheet Rev 1.0
Page 4
CT85x Series
Bipolar Digital TMR Latch
for Consumer
& Industrial Applications
Table 5: Electrical Characteristics for CT85x Series
Unless otherwise specified: V
DD
= 2.7 V to 3.6 V, T
A
=
-40°C
to +125°C. Typical values are V
DD
= 3.0 V and T
A
= +25°C.
Parameter
Power-On Time
Under-voltage Lockout Threshold,
Rising V
DD
Under-voltage Lockout Threshold,
Falling V
DD
Under-voltage Lockout Hysteresis
Push-Pull Output
Output Voltage High OUT
Output Voltage Low OUT
Current for OUT
Symbol Conditions
t
ON
V
UVLO_RISE
V
UVLO_FALL
V
UV_HYST
V
DD
> 2.7 V
Rising V
DD
Falling V
DD
Min
Typ
500
2.20
Max
Unit
µs
2.60
V
V
mV
1.90
2.15
50
V
OH
V
OL
I
OUT
I
OUT
=
-2
mA
I
OUT
= +2 mA
0.9
V
DD
0.1
V
DD
±2
V
V
mA
(1) Guaranteed by design and bench characterization.
Typical Timing Characteristics for CT85x
V
DD
= 3.0 V and T
A
= +25°C, C
DD
= 1.0 µF (unless otherwise specified).
Figure 3.
Power-On Time for Push-pull Output (V
DD
and OUT)
2018 Crocus Technology
Document Number CT85x Series Datasheet Rev 1.0
Page 5
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