Ideally, you would use MX1 and MX2 as triggers and latch the values on the digital bus. Post as a guest Name. The track just above C02 the small brown part in the upper right hand corner is the track that connects the ADR pin of the SAA to ground right side of C I've designed it into 2 commercial instruments.
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Therefore changing the address of it requires some cutting and rewiring.
You may select a segment current from 3 to 21mA in steps of 3mA by setting the appropriate bits. You can measure a triangular shaped waveform of about 2.
SAA1064 Philips 4-digit Led-driver With I2c-bus Interface Dip-24 1pc
This isn't a complete project really. I've salvaged this module from a scrap Nokia Hotel TV, but it is fairly easy to build it yourself because it needs only a few components.
I've designed it into 2 commercial instruments. Thus not very useful, so I will restrict myself to the write mode only. Sign up or log in Sign up using Google. Did I mention that Display number 1 is the right most digit? Post as a guest Name. These displays are driven by a SAA, like so: I sza1064 a raspberry pi whose I2C bus is already in use, at KHz and I want to use it to read the values being displayed.
SAA 4 Digit 7-Segment LED driver with I2C interface | Mbed
Even if reading back through I 2 C were possible, you eaa1064 have to implement a milti-master such that it doesn't interfere with the original I 2 C activity inside the heating system. The heart of the circuit is of course the SAA, which is made sa1064 Philips. The 4 little holes on the right hand side of the picture are the connections to the outside world.
Unfortunately the address pin on my module is hard wired to ground.
SB-Projects - Projects - SAA
Navigation How to navigate Sponsors Please consider clicking on the Support Me button to show your appreciation. It is operated in the so called dynamic mode, which means that the two 8-bit outputs of the chip can drive four 7-segment displays in a multiplexed mode. The Circuit Diagram See, I told you it only uses a few components. This page is meant as a reference for myself, and for you if you want to build one of my projects that uses it.
SAA1064 4 Digit 7-Segment LED driver with I2C interface
Fortunately they mixed up both channels in the same way, which makes it very simple to unscramble the lot in software. Addressing Now we come to the point of addressing. Would using I2C IO expanders be an idea?
Sign up using Facebook. It selects between static or dynamic mode, and whether the display s saa10064 both ports should be on or not. Ideally, you would use MX1 and MX2 as triggers and latch the values on the digital bus. This SAA datasheet here receives it's information through I2C from the main computer, and the displays are multiplexed. By the way, SAA has been discontinued. The control byte controls the behaviour of the chip.