ZSSC41xx SSC Evaluation Board User Guide
© 2019 Integrated Device Technology, Inc.
4
May 13, 2019
2.
Hardware Description
2.1
Kit Overview
A primary purpose of the ZSSC41xx Evaluation Kit is communication between the user’s computer and the ZSSC41xx DUT on the ZSSC41xx
SSC EB. The computer sends commands and data via its USB port (configured as a virtual COM port) to the SSC-CB. The microcontroller on
the SSC-CB interprets these commands and relays them to the ZSSC41xx in the I2C or OWI
*
(One-Wire Interface) communication mode. Refer
to the SSC Communication Board Datasheet for additional information about this board (see section 5).
The optional SSC-SRB provides a replacement for an actual resistive sensor and can be used for the first step of a calibration demonstration
or a “dry-run” calibration. On the SSC-SRB, the sensor replacement signal is controlled by a potentiometer and provides a signal ranging from
2mV to 110mV to the analog front-end of the ZSSC41xx (BR1N and BR1P pins) and a temperature sensor signal from a 1N4148 diode to the
ZSSC41xx temperature input (TS1 or TS2 pin, selectable by jumper K8, not applicable to the ZSSC4175D-01). Refer to the SSC Sensor
Replacement Board Datasheet for additional information about this board (see section 5).
The SENT (Single Edge Nibble Transmission) interface signal (not applicable to the ZSSC4151) is a one-way transmission of values from the
DUT to the SSC-CB microcontroller (intended for Normal Operation Mode only). The SENT interface allows high-resolution data transmission
with a lower system cost than other serial data solutions. If enabled (see Table 1), the “Sensor 2” header can be used as a SENT input from an
external user module for the ZSSC416x and ZSSC417x families (not applicable to the ZSSC4151). The “Sensor 1” header can be used for
either a SENT input (not applicable to ZSSC4151) or an OWI interface (required for ZSSC4151) for an external user module.
Figure 2. Alternative User Sensor Module Connection Options
Sensor Module
with AOUT/OWI
Sensor Module
with SENT
KL1/KL2/KL3: Optional screw terminals for
the user s sensor if the SSC-SRB is not used
The microcontroller will forward any data bytes from the ZSSC41xx back to the user’s computer via the USB connection. These bytes can be
sensor and temperature readings to be displayed by the software on the computer, raw analog-to-digital converter (ADC) data used during
calibration, or EEPROM data. The SSC-CB microcontroller controls the power signals required for entering the Command Mode.
The ZSSC41xx power (VDDE) can be supplied from the CB KS5V power supply (jumper K7 closed; see Figure 3) or from an external supply
(VDDE2) connected across the VDDE2 and VSSE post on the KL1 screw terminal (jumper K7 must be open).
Important: Ensure that jumper K7 is open before connecting an external VDDE2 power supply.
If connected, the VDDE2 supply can be switched ON or OFF by the CB-controlled KS5V signal and the IC4 power MOSFET as needed to
establish OWI communication.
* OWI is also referred to as ZACwire™.
