Philips UZZ9000 Datasheet

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UZZ9000

Sensor Conditioning Electronic

Product specification			2000 Nov 27
Supersedes data of 2000 May 19

Philips Semiconductors	Product specification
Sensor Conditioning Electronic	UZZ9000

FEATURES

∙One chip fully integrated signal conditioning IC

∙Accuracy better than 1° together with KMZ41 in 100° angle range

∙Temperature range from −40 to 150 °C

∙Adjustable angle range

∙Adjustable zero point.

GENERAL DESCRIPTION

The UZZ9000 is an integrated circuit that combines two sinusoidal signals (sine and cosine) into one single linear output signal. When used in conjunction with the magnetoresistive sensor KMZ41 it provides a measurement system for angles up to 180°. The UZZ9000 can also be used for other applications in which an angle has to be calculated from a sine and a 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. Since today’s applications typically require analog output signals

(e.g. potentiometers), the resulting signal is transferred back to the analog domain.

The UZZ9000 enables the user to set both the angle range and the zero point offset. These ranges are set by external voltage dividers.

QUICK REFERENCE DATA

PINNING

SYMBOL	PIN	DESCRIPTION
+VO2	1	sensor 2 positive differential input
+VO1	2	sensor 1 positive differential input
VDD2	3	digital supply voltage
VSS	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
VOUT	12	output voltage
Var	13	angle-range input set
Voffin	14	offset input set
OFFS2	15	offset trimming input sensor 2
OFFS1	16	offset trimming input sensor 1
VDDA	17	analog supply voltage
GND	18	analog ground
TEST4	19	for production test; note 1
TEST5	20	for production test; note 1
VDD1	21	digital supply voltage
Tout	22	test output
−VO2	23	sensor 2 negative differential input
−VO1	24	sensor 1 negative differential input

Notes

1.Connected to ground.

2.Pin to be left unconnected.

SYMBOL	PARAMETER	CONDITIONS	MIN.	TYP.	MAX.	UNIT
VDDA	supply voltage	note 1	4.5	5	5.5	V
VDD1	supply voltage	note 1	4.5	5	5.5	V
VDD2	supply voltage	note 1	4.5	5	5.5	V
ICCtot	total supply current		−	13	15	mA
A	angle range	in 10° steps with KMZ41	30	−	180	deg
A	accuracy	with ideal input signal; range = 100°	±0.45	−	−	deg

Note

1. VDDA, VDD1 and VDD2 must be connected to the same supply voltage.

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Philips Semiconductors						Product specification
Sensor Conditioning Electronic							UZZ9000
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134).
SYMBOL	PARAMETER			CONDITIONS	MIN.	MAX.		UNIT
VDDA	supply voltage				−0.3	+6		V
VDD1	supply voltage				−0.3	+6		V
VDD2	supply voltage				−0.3	+6		V
Vpin	voltage at all pins				−0.3	VDD		V
Tstg	storage temperature				−55	+150		°C
Tj	operating temperature		125 to 150 °C; max 200 hours		−40	+150		°C
THERMAL CHARACTERISTICS
SYMBOL		PARAMETER			VALUE			UNIT
Rth j-a	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

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Philips Semiconductors	Product specification
Sensor Conditioning Electronic	UZZ9000

ELECTRICAL CHARACTERISTICS

Tamb = −40 to +150 °C; VDD = 4.5 to 5.5 V; typical characteristics for Tamb = 25 °C and VDD = 5 V unless otherwise specified.

SYMBOL	PARAMETER	CONDITIONS	MIN.		TYP.	MAX.	UNIT
VDDA	supply voltage		4.5	5		5.5	V
VDD1	supply voltage		4.5	5		5.5	V
VDD2	supply voltage		4.5	5		5.5	V
IDD	supply current	without load	−	10		15	mA
(+VO)-(−VO)	differential input voltage	referred to VDD	±6.6	−		±28	mV/V
	common mode range	referred to VDD	490	−		510	mV/V
	lost magnet threshold	referred to VDD	−	3		−	mV/V
fext	external clock frequency	for trim interface	0.1	−		1	MHz
fint	internal clock frequency	Tj = −40 to 150 °C	2.3	4		5.7	MHz
Cload	output load		−	−		50	pF
		with series resistance	−	−		200	nF
		>300 Ω
Vreset	switching voltage threshold	between falling and	2.8	−		4.5	V
	for power on/off	rising VDD
	hysteresis		−	0.3		−
Vout	output voltage range for	lower bound	5	−		6	% VDD
	valid ranges	upper bound	94	−		95	% VDD
Vd	diagnostic area	for irregular input	0	−		4	% VDD
		signal	96	−		100	% VDD
A	accuracy	with ideal input signal;	±0.45	−		−	degree
		range = 100°
Res	resolution	range = 100°	0.1	−		−	degree
ton	power up time		−	−		20	ms
tr	response time	to 95% of final value	−	0.7		1.2	ms
VLM	sensor voltage	lost magnet threshold	12	15		20	mV

FUNCTIONAL DESCRIPTION

The UZZ9000 is a mixed signal IC for angle measurement systems. The UZZ9000 has been designed for the double sensor KMZ41. It combines two analog signals (sine and cosine) into a linear output signal. The analog measurement signals on the IC input are converted to digital data by two ADC’s. Each ADC is 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 bit-stream with an over-sampling frequency of typically 500 kHz. The bit-stream is fed into a decimation filter which

performs both low pass filtering and down-sampling. The IC 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 by the ALU. This calculation is carried out using the so-called CORDIC algorithm. The angle is represented by a 13-bit resolution. A DAC converts the digital signal back to the analog domain.

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Philips Semiconductors	Product specification
Sensor Conditioning Electronic	UZZ9000

+VO1

ADC1

DECIMATION

ALU

DAC

output

−VO1

FILTER

+VO2

ADC2

DECIMATION

−VO2

FILTER

angle range

CONTROL

offset

RESET

UZZ9000

OSCILLATOR

DATA-CLK

SMODE

MHB694

reset

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.The decimation filter block comprises two digital low pass decimation filters convert the low resolution high speed bit stream output from the ADC’s 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 DAC converts the output of the ALU block to an analog signal.

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 generates the master clock.

Angle range selection

In order to accommodate varying applications, both the mechanical input angular range of the UZZ9000 and the zero point of the output curve are user programmable. This section describes how to select a desired mode.

The output curve is adjusted by changing the angular range as shown in Fig.2. Without any zero point offset, the ramp-up starts at mechanical 0° (α1 = 0°). When using a KMZ41 sensor, the maximum angular range Δα

is 0° to 180°. For the UZZ9000, smaller angular ranges can be set. In this case, α2 becomes smaller than 180° and the output curve is clipped at this position. The location of discontinuity XD (change from lower to upper clipping area) depends on the adjusted range and can be calculated as follows:

X = Δα + 180° –Δα

D --------------------------

2

In order to compensate for tolerances, the zero point of the output curve can be shifted by ±5˚ in steps of 0.5°. The effect of this measure is shown in Fig.3. Now α1 is no longer identical with mechanical 0˚, but with the zero point shift Xoff. Consequently, the location of discontinuity XD can be calculated as follows:

X = x + Δα + 180° –Δα

D off --------------------------

2

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