DRV5055 datasheet(10/30 Pages) TI1

部品番号	DRV5055

部品情報	Ratiometric Linear Hall Effect Sensor

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VQ(VCC) / VQ(3.3V)

1 ±

VCC / 3.3V

VQRE =

for VCC = 3 V to 3.63 V

VQ(VCC) / VQ(5V)

1 ±

VCC / 5V

VQRE =

for VCC = 4.5 V to 5.5 V,

S(VCC) / S(3.3V)

1 ±

VCC / 3.3V

SRE =

for VCC = 3 V to 3.63 V

S(VCC) / S(5V)

1 ±

VCC / 5V

SRE =

for VCC = 4.5 V to 5.5 V,

VL(MAX) ± VQ(MAX)

S(MAX)

BL(MIN) =

B

south

north

OUT

0 mT

0 V

VCC

VL (MIN)

VL (MAX)

VCC / 2

10

DRV5055

SBAS640 – JANUARY 2018

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Feature Description (continued)

Figure 10. Magnetic Response

Equation 2 calculates parameter BL, the minimum linear sensing range at 25°C taking into account the maximum

quiescent voltage and sensitivity tolerances.

(2)

The parameter SLE defines linearity error as the difference in sensitivity between any two positive B values, and

any two negative B values, while the output is within the VL range.

The parameter SSE defines symmetry error as the difference in sensitivity between any positive B value and the

negative B value of the same magnitude, while the output voltage is within the VL range.

7.3.4 Ratiometric Architecture

The DRV5055 has a ratiometric analog architecture that scales the quiescent voltage and sensitivity linearly with

the power-supply voltage. For example, the quiescent voltage and sensitivity are 5% higher when VCC = 5.25 V

compared to VCC = 5 V. This behavior enables external ADCs to digitize a consistent value regardless of the

power-supply voltage tolerance, when the ADC uses VCC as its reference.

Equation 3 calculates sensitivity ratiometry error:

where

•

S(VCC) is the sensitivity at the current VCC voltage

•

S(5V) or S(3.3V) is the sensitivity when VCC = 5 V or 3.3 V

•

VCC is the current VCC voltage

(3)

Equation 4 calculates quiescent voltage ratiometry error:

where

•

VQ(VCC) is the quiescent voltage at the current VCC voltage

•

VQ(5V) or VQ(3.3V) is the quiescent voltage when VCC = 5 V or 3.3 V

•

VCC is the current VCC voltage

(4)

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