Philips UZZ9001 Datasheet

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UZZ9001

Sensor Conditioning Electronic

Product speciﬁcation Supersedes data of 2000 May 19

2000 Nov 27

Philips Semiconductors Product speciﬁcation

Sensor Conditioning Electronic UZZ9001

FEATURES

• One chip angle sensor output signal conditioning

• 180° angle range with KMZ41

• Accuracy better than 1° together with KMZ41

• Temperature range from −40 to +150 °C

• SPI protocol

• SO24 package.

GENERAL DESCRIPTION

The UZZ9001 is an integrated circuit that combines two sinusoidal signals (sine and cosine) into one single linear output signal. These signals might come from the magnetoresistive sensor KMZ41. This results in a measurement system for angles up to 180°. The integrated circuit UZZ9001 can also be used for all other applications in whichan angle has to be calculated from a sine and cosine signal. A typical application would be any kind of resolver application. The two input signals are converted into the digital domain with two separate AD converters. A CORDIC algorithm performs the inverse tangent transformation. The output stage implements the Motorola Serial Peripheral Interface (SPI) protocol.

PINNING

SYMBOL PIN DESCRIPTION

+V +V V V

O1 DD2 SS

1 sensor 2 positive differential input 2 sensor 1 positive differential input 3 digital supply voltage

4 digital ground GND 5 analog ground RST 6 reset of the digital part; note 1 TEST1 7 for production test; note 1 TEST2 8 note 2 DATA_CLK 9 trim-mode data-clock; note 1 SMODE 10 serial mode programmer; note 1 TEST3 11 note 2 data 12 SPI data output CLK 13 SPI data clock in CS 14 SPI chip select OFFS2 15 offset trimming input sensor 2 OFFS1 16 offset trimming input sensor 1 V

DDA

17 analog supply voltage GND 18 analog ground TEST4 19 for production test; note 1 TEST5 20 for production test; note 1 V T

−V

DD1 out

O2 O1

21 digital supply voltage

22 test output

23 sensor 2 negative differential input

24 sensor 1 negative differential input

Notes

1. Connected to ground.

2. Pin to be left unconnected.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

DDA

DD1

DD2

CCtot

supply voltage note 1 4.5 5 5.5 V supply voltage note 1 4.5 5 5.5 V supply voltage note 1 4.5 5 5.5 V

total supply current no output load − 515mA Res resolution − 13 − bit A accuracy with ideal input signal ±0.35 −−deg I

data-out

peak output current −−10 mA

Note

1. V

DDA

, V

DD1

and V

must be connected to the same supply voltage.

DD2

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Philips Semiconductors Product speciﬁcation

Sensor Conditioning Electronic UZZ9001

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

DDA

DD1

DD2

stg

amb

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

th j-a

supply voltage −0.3 +6 V supply voltage −0.3 +6 V supply voltage −0.3 +6 V voltage at all pins −0.3 V

V storage temperature −55 +150 °C operating temperature 125 to 150 °C; max 200 hours −40 +150 °C

thermal resistance from junction to ambient 80 K/W

ESD SENSITIVITY

SYMBOL PARAMETER CONDITIONS VALUE UNIT

ESD ESD sensitivity human body model 2 kV

machine model ±150 V

2000 Nov 27 3

Philips Semiconductors Product speciﬁcation

Sensor Conditioning Electronic UZZ9001

ELECTRICAL CHARACTERISTICS

= −40 to +150 °C; VDD= 4.5 to 5.5 V; typical characteristics for T

amb

speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

DDA

DD1

DD2

(+V

)-(−VO) differential input voltage referred to V

ext

int

supply voltage 4.5 5 5.5 V supply voltage 4.5 5 5.5 V supply voltage 4.5 5 5.5 V supply current without load − 515mA

common mode range referred to V lost magnet threshold referred to V

DD DD

external clock frequency for trim interface 0.1 − 1 MHz internal clock frequency 2.3 4 5.7 MHz data output constant current −−1mA

peak current −−10 mA

reset

switching voltage between falling and

threshold

rising V

hysteresis − 0.3 − V A accuracy with ideal input signal ±0.35 −−degree Res resolution − 13 − bit t

power up time −−20 ms response time to 95% of ﬁnal value − 0.7 1.2 ms digital input voltage LO signal 0 − 0.3xV

HI signal 0.7 x V

digital output voltage LO signal −−0.4 V

HI signal V

sensor voltage lost magnet threshold 12 15 20 mV

=25°C and VDD= 5 V unless otherwise

amb

±6.6 −±28 mV/V 490 − 510 mV/V

−3−mV/V

2.8 − 4.5 V

− V

−0.8 −−V

FUNCTIONAL DESCRIPTION

The UZZ9001 is a mixed signal IC for angle measurement systems. It combines two analog signals (sine and cosine) into a linear output signal. The output stage implements the Motorola Serial Peripheral Interface (SPI) protocol. The UZZ9001 has been designed for use with the double sensor KMZ41. The analog measurement signals on the IC input are converted to digital data with two ADC’s. The ADC’s are a Sigma-Delta modulator employing a 4th order continuous time architecture with an over-sampling ratio of 128 to achieve high resolution. The converter output is a digital bitstream with an over-sampling frequency of typically 500 kHz.

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The bitstream is fed into a decimationfilter which performs both low pass filtering and down-sampling. TheIC has two input channels each of which has its own ADC and decimation filter. The two decimation filter outputs are 15-bit digital words at a lower frequency of typically

3.9 kHz which is the typical sampling frequency of the sensor system. The digital representations of the two signals are then used to calculate the current angle. This calculation is carried out using the so-called CORDIC algorithm. The angle is represented with a 13-bit resolution. An SPI compatible interface converts the output word to the serial peripheral interface protocol.

Philips Semiconductors Product speciﬁcation

Sensor Conditioning Electronic UZZ9001

handbook, full pagewidth

−V

ADC1

ADC2

DECIMATION

FILTER

DECIMATION

FILTER

ALU SPI CLK

data CS

RESET

reset

UZZ9001

Fig.1 Block diagram.

The following list gives a short description of the relevant block functions:

1. The ADC block contains two Sigma Delta AD converters, sensor offset correction circuitry and the circuitry required for the sensitivity and offset adjustment of the chip output voltage curve.

2. Two digital low pass decimation filters convert the low resolution high speed bit stream coming from the ADC Sigma Delta converters into a low speed digital word.

3. The ALU block derives an angle value from the two digital inputs using the CORDIC algorithm.

4. The SPI converts the output of the ALU block to a SPI compatible 16 bit word.

5. The CONTROL block provides the clock and the control signals for the chip.

6. The RESET block supplies a reset signal during power-up and power-down when the power supply is below a certain value.

7. The Oscillator unit generates the master clock.

CONTROL

OSCILLATOR

MHB698

DATA-CLK SMODE

Serial Peripheral interface (SPI)

The UZZ9001 provides an interface to SPI compatible devices, and as a slave node functions in one operational mode only. For Motorola SPI devices, this mode is selected by setting CPHA to 1 and CPOL to 1. In this transfer mode, data bits are sampled by the master using the leading edge of the clock as shown in Figure 2. The falling edge indicates that the next data bit has to be provided by the slave device (shift operation). Anadvantageofthis mode is that the CS input toggles only once between every two sensor data bytes (see Fig.3). Data transmission can be stopped by the user at any time. The leading edge of the CS input initialises the SPI shift register allowing the start ofa complete new transmission. Ifthe CS line isheld active low duringstop of transmission, resumption of transmission can be made without loss of data

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