co2128-48li-3sp Connect One Ltd., co2128-48li-3sp Datasheet - Page 43

• Manufacturer Part Number: co2128-48li-3sp
• Description: Chip? Co2064, Co2128 And Co2144 Are Full-featured Programmable Ip Communication Controller? Chips That Act As Coprocessors To Offload Security And Ip Connectivity Tasks From Any Host Processor.
• Manufacturer: Connect One Ltd.

Connect One
Electrical Specifications
8.3 I/O Line
8.3.1 JTAG Port Pins
TMS, TDI and TCK are Schmitt trigger inputs and are not 5V tolerant. TMS, TDI and TCK do
not integrate a pull-up resistor. TDO is an output, driven at up to VDDIO, and has no pull-up
resistor. The JTAGSEL pin is used only on the prototype. It enables or disables the JTAG
debug functionality.
8.3.2 Reset Pin
The NRST pin is bidirectional with an open drain output buffer. It is handled by the on -chip
reset controller and can be driven low to provide a reset signal to the external components or
asserted low externally to reset the microcontroller. There is no constraint on the length of the
reset pulse, and the reset controller can guarantee a minimum pulse length. This allo ws
connection of a simple push-button on the NRST pin as system user reset, and the use of the
signal NRST to reset all the components of the system. The NRST pin integrates a
permanent pull-up resistor to VDDIO.
8.3.3 PIO Controller Lines
All the PIO lines spec to 3.3V with +/- 10% and have an integrated programmable pull-up
resistor. Programming of this pull-up resistor is performed independently for each I/O line
through the PIO controllers. Driving an I/O line with a voltage over VDDIO while the
programmable pull-up resistor is enabled can lead to unpredictable results. Care should be
taken, in particular at reset, as all the I/O lines default to input with pull -up resistor enabled at
reset.
8.3.4 I/O Lines Current Drawing
All the PIO lines can draw up to 8 mA. However, the total current drawn by all the I/O lines
must not exceed 150 mA.
iChip CO2064/CO2128/CO2144 Data Sheet
Preliminary
8-2