Philips saa9740h DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

SAA9740H

Advanced Auto Control Function (A2CF)

Product speciﬁcation Supersedes data of 1996 Jan 30 File under Integrated Circuits, IC02

1996 Oct 10

Philips Semiconductors Product speciﬁcation

Advanced Auto Control Function (A2CF) SAA9740H

FEATURES

• One chip full digital Auto Focus (AF), Auto Exposure (AE) and Auto White Balance (AWB)

• Possible to use NTSC and PAL CCD with horizontal resolution of 510, 670, 720 or 768 pixels

• No manual adjustment

• One microprocessor system commonly used with

CAMera Digital Signal Processor (CAMDSP) SAA9750H

• 8-bit parallel microprocessor interface

• LQFP64 package (0.5 mm pitch)

• Single 3 V power supply.

Auto Focus features

• Video AF system

• Two windows system (a small centre and large window)

• The window size and place are microprocessor

controlled

• Including 5

order IIR digital high-pass filter

• Line peak accumulation in the large window

• High-pass filter’s output accumulation in one field.

Auto Exposure features

• 5 windows accumulation

• Calculation of white-clip by centre window

• Possible to control size and place of the centre windows

by the light condition with microprocessor.

Auto White Balance features

• Mono colour detection

• Accumulation of UV data in the corresponding UV

quadrant

• Green and Magenta elimination gate

• Luminance gate for detecting white

• UV limiter

• White-clip detection/counter.

GENERAL DESCRIPTION

The Advanced Auto Control Function (A2CF) is to be used for a colour CCD camera system. This IC can realize AWB, AF and AE with a microprocessor. This device consists of an input data selector, a parallel 8-bit microprocessor interface, a data accumulator, a window generator, a command decoder and AWB, AF, AE for each processing block.

QUICK REFERENCE DATA

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

amb

digital supply voltage (pins 6, 18 and 47) 2.7 3.0 3.3 V LOW level digital input voltage 0 − 0.3V HIGH level digital input voltage 0.7V

− V

V LOW level digital output voltage −−0.5 V HIGH level digital output voltage VDD− 0.5 −−V operating ambient temperature −20 − +70 °C

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

SAA9740H LQFP64 plastic low proﬁle quad ﬂat package; 64 leads; body 10 × 10 × 1.4 mm SOT314-2

1996 Oct 10 2

Philips Semiconductors Product speciﬁcation

Advanced Auto Control Function (A2CF) SAA9740H

BLOCK DIAGRAM

to

LWDB

WDMNT

WDINT

ASTB

WRB

RDB

RSTB28IO7 to IO0

TSTOUT7

TSTOUT1

MHA286

UV_SEL

HSYNC

DD3

to V

DD1

+3 V

373632

34 33 35 86, 18, 47

WINDOW

GENERATOR

H/V

COUNTER

SAA9740H

57 to 50

enable signals

18-BIT

ADDER

AUTO

FOCUS

20 to 27

INTERFACE

MICROPROCESSOR

PEAK

HOLD

AUTO

EXPOSURE

61 to 64, 1

AUTO

16 to 9

CLIP

WHITE

BALANCE

39, 38, 45 to 41

CLK1

1/2 CLK1

CLOCK

GENERATOR

TST1

TSTIN3

TSTIN2

TSTIN1

WCLIP

SCAN_T

SS5

to V

SS1

7, 19 46, 49, 59

CLK2OUT

Fig.1 Block diagram.

1996 Oct 10 3

handbook, full pagewidth

to

CDS7

CDS0

Y7 to Y3

UV7 to UV0

CLK1

AMSAL

Philips Semiconductors Product speciﬁcation

Advanced Auto Control Function (A2CF) SAA9740H

PINNING

SYMBOL PIN TYPE DESCRIPTION

Y3 1 input Y input from SAA9750H (CAMDSP) (LSB) TSTIN1 2 input input pin for test TSTIN2 3 input input pin for test TSTIN3 4 input input pin for test TST1 5 input input pin for test V

DD1

SS1

UV_SEL 8 input UV select input from SAA9750H (CAMDSP) UV0 9 input UV input from SAA9750H (CAMDSP) (LSB) UV1 10 input UV input from SAA9750H (CAMDSP) UV2 11 input UV input from SAA9750H (CAMDSP) UV3 12 input UV input from SAA9750H (CAMDSP) UV4 13 input UV input from SAA9750H (CAMDSP) UV5 14 input UV input from SAA9750H (CAMDSP) UV6 15 input UV input from SAA9750H (CAMDSP) UV7 16 input UV input from SAA9750H (CAMDSP) (MSB) WCLIP 17 input white-clip input from SAA9750H (CAMDSP) V

DD2

SS2

IO7 20 bidirectional microprocessor interface (MSB) IO6 21 bidirectional microprocessor interface IO5 22 bidirectional microprocessor interface IO4 23 bidirectional microprocessor interface IO3 24 bidirectional microprocessor interface IO2 25 bidirectional microprocessor interface IO1 26 bidirectional microprocessor interface IO0 27 bidirectional microprocessor interface (LSB) RSTB 28 input system reset RDB 29 input read control from microprocessor WRB 30 input write control from microprocessor ASTB 31 input address set from microprocessor WDINT 32 output window interrupt VD 33 input V-drive signal input HD 34 input H-drive signal input HSYNC 35 input HSYNC input WDMNT 36 output window monitor for test (open-drain) LWDB 37 output large window for test (open-drain) TSTOUT6 38 output output pin for test TSTOUT7 39 output output pin for test CLK2OUT 40 output output pin of internal clock (open-drain)

6 − digital supply voltage 7 − ground

18 − digital supply voltage 19 − ground

1996 Oct 10 4

Philips Semiconductors Product speciﬁcation

Advanced Auto Control Function (A2CF) SAA9740H

SYMBOL PIN TYPE DESCRIPTION

TSTOUT1 41 output output pin for test TSTOUT2 42 output output pin for test TSTOUT3 43 output output pin for test TSTOUT4 44 output output pin for test TSTOUT5 45 output output pin for test V

SS3

DD3

CLK1 48 input clock V

SS4

CDS0 50 input CDS input from ADC (LSB) CDS1 51 input CDS input from ADC CDS2 52 input CDS input from ADC CDS3 53 input CDS input from ADC CDS4 54 input CDS input from ADC CDS5 55 input CDS input from ADC CDS6 56 input CDS input from ADC CDS7 57 input CDS input from ADC (MSB) SCAN_T 58 input test control for scan test V

SS5

AMSAL 60 input for testing Y7 61 input Y input from SAA9750H (CAMDSP) (MSB) Y6 62 input Y input from SAA9750H (CAMDSP) Y5 63 input Y input from SAA9750H (CAMDSP) Y4 64 input Y input from SAA9750H (CAMDSP)

46 − ground 47 − digital supply voltage

49 − ground

59 − ground

1996 Oct 10 5

Philips Semiconductors Product speciﬁcation

Advanced Auto Control Function (A2CF) SAA9740H

handbook, full pagewidth

Y3 TSTIN1 TSTIN2 TSTIN3

TST1

DD1

SS1

UV_SEL

UV0 UV1 UV2 UV3 UV4 UV5 UV6 UV7

61 1 2 3 4 5 6 7 8

AMSAL 60

SS5

V 59

SCAN_T

CDS7

CDS6 56

CDS5 55

CDS4 54

CDS3

CDS2

CDS1

SAA9740H

10 11 12 13 14 15 16

CDS0 50

SS4

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

CLK1 V

DD3

SS3

TSTOUT5 TSTOUT4 TSTOUT3 TSTOUT2 TSTOUT1 CLK2OUT TSTOUT7 TSTOUT6 LWDB WDMNT HSYNC HD VD

1996 Oct 10 6

WCLIP

DD2

SS2

24 IO3

IO4

IO5

IO6

IO7

Fig.2 Pin configuration.

25 IO2

26 IO1

27 IO0

RSTB

RDB

WRB

ASTB

WDINT

MHA285

Philips Semiconductors Product speciﬁcation

Advanced Auto Control Function (A2CF) SAA9740H

FUNCTIONAL DESCRIPTION

The Advanced Auto Control Function (A2CF) will be used for colour CCD camera systems.

The input signals are CDS (AF data) from 8-bit ADC, Y (for AE, 5-bit) and UV (for AWB, 8-bit) data as the output of SAA9750H (CAMDSP) and they are fed into the A2CF. After being processed in the A2CF, corresponding data are led into the microprocessor.

Together with the zoom encoder and focus sensor output the microprocessor does the following control with the data of A2CF:

• Control focus motor

• Control iris, AGC (via DAC) and high speed shutter

• Send the control data to SAA9750H (CAMDSP) via

serial bus.

CLK1 is depending on the CCD type. To cope with the different CCD clocks, some reference data have to be set by the microprocessor.

AF system

handbook, halfpage

active video

This maximum focus value is accumulated in the AF window (see Fig.3) by the 18-bit adder. The values in the large window are stored in REG2 (see Table 7) and those in the small window are stored in REG3 (see Table 7). Which data is used is dependent on the software (see Tables 6 and 7). Besides this accumulation, line peak accumulation is also done. This data is the maximum value in one field and is stored in REG0 (see Table 7).

AE system

handbook, halfpage

324

active video

MHA288

Fig.4 AE window.

large window

centre

window

MHA287

Fig.3 AF window.

Digital CDS signals CDS7 to CDS0 which come after AGC, gamma processing and ADC are fed into A2CF. This 8-bit data is shifted to the most suitable 6-bit data for AF processing by microprocessor. For example, when the MSB of them is ‘1’ then the 6-bit data is shifted by the microprocessor to CDS7 to CDS2 (not CDS6 to CDS1 or CDS5 to CDS0; see Table 4). After AF shifting the signals go through an LPF and they are down sampled. The down sampling is done by CLK2 (CLK1/2). In order to detect the high frequency component for AF processing, one HPF is added. This output is the focus value. Next peak hold block is for acquiring maximum focus value of every line in one field.

5-bit Y signals Y7 to Y3 which come from SAA9750H are fed into A2CF for AE processing. This signal is internally extended to 6 bits by adding a ‘0’ as new MSB. Next they go through an LPF and they are down sampled in the same way as AF processing. In order to prevent overflow of the 18-bit adder block, 2 modes exist (see Table 4). The first is H decimation is on oroff. If H decimation is on, then the data for AE processing is available in every other line. The second mode is that the data for AE processing

is shifted to

⁄2 or not. If the data is shifted to1⁄2, it is done

before down sampling and before the data going to the 18-bit adder becomes1⁄2. Both these modes are controlled by the microprocessor. In AE mode there are 5 windows as shown in Fig.4. These windows are controlled by the microprocessor. The accumulation data in window 1 to window 5 is respectively stored in REG1 to REG5 (see Table 7). The white-clip count data in the centre window is stored to the lower 5 bits of REG0 (see Table 7). The upper 3 bits of REG0 is the overflow information in the 18-bit adder (see Table 7).

1996 Oct 10 7

+ 14 hidden pages