8 Printer systems
Printer systems
• Temperature and Humidity sensor
Both PCAs are connected through an 8-pin connector. The 2nd ISS connector is connected to the
PrintMech in a daisy-chained connection the 1st ISS board by means of this 8-pin connector.
All the board functionality is controlled by means of two I2C buses: PILS_I2C and ACU_I2C. The bus
controllers are inside the ASIC, placed on the main PCA.
The PILS_I2C bus is operated at 400 KHz and the devices connected to it are an I/O Expander, an ADC
and the Back-up EEPROM. The functionality of each of these devices is explained below.
• I/O Expander: Used for Presence and Broken Bag detection. It generates an interruption each time
a presence event or a broken bag event occurs. This interrupt line is taken to an Impact GPIO. The I/
O expander also controls the multiplexers for the PILS measurement circuitry and the Acumen
interface. The device contains 16 I/O ports.
• ADC: This measures the PILS signal, and the signals coming from all the sensors on the PCA, i.e.
temperature, humidity and air pressure sensors. It is a 12-bit, 8-channel A/D converter.
• EEPROM: 32KByte memory for storage of tubes and system back-up information (NVM).
The other I2C bus, the ACU_I2C, is operated at 100 KHz and it is used to communicate with the Ink
Supply Acumen. This bus is multiplexed on the ISS board through an analog multiplexer.
The ISS is connected to the PrintMech through a 10-pin connector. The pins-out of this connector are listed
in the following table, together with a description of all the signals:
Besides the PrintMech connector, there is an 8-pin connector to allow for expandability with the 2nd ISS
board (lower PCA). The 2nd ISS connector is connected to the PrintMech in a daisy-chained way through the
1st ISS board (top PCA) by means of this 8-pin connector. The pins-out of this connector are listed in the
following table, together with a description of all the signals:
Pin # Pin Name Description
1GNDGround.
2 +12 V 12 Volts to power the ISS board.
3 ACU_SDA Data line of ink supply I2C acumen interface.
4 ACU_SCL Clock line of ink supply I2C acumen interface.
5 PWM_OFF Signal to shut down air pump PWM in PrintMech in case of overpres-
sure.
6 ISS_INT Interrupt to alert Impact of a presence detection or broken bag event.
7 ADDR Signal sets the I2C slave address of ISS devices and allows for
expandability in case a 2nd ISS board is needed for a future product.
8 PILS_SDA Data line of the PILS I2C interface.
9 PILS_SCL Clock line of the PILS I2C interface.
10 GND Ground.
Pin # Pin Name Description
1GND Ground.
2 +12 V 12 Volts to power the ISS board.
3 ACU_SDA Data line of ink supply I2C acumen interface.
4 ACU_SCL Clock line of ink supply I2C acumen interface.
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