ZHCSIF5G December 2015 – July 2024 TPS99000-Q1
PRODUCTION DATA
The TPS99000-Q1 has three serial interfaces that transmit data into and out of the device. All of these interfaces have a maximum clock speed of 30MHz. To help prevent high levels of EMI emissions, these signals should be laid out with impedance-matched, low-inductance traces. In particular, the three clocks for these interfaces should be low inductance, and if a cable or a connector is used, the clock signal should be adjacent to the ground signal return.
| PIN | NAME | FUNCTION |
|---|---|---|
| 27 | SPI1_CLK | Clock (30MHz) |
| 28 | SPI1_SS_Z | Secondary Select |
| 29 | SPI1_DOUT | Data |
| 30 | SPI1_DIN | Data |
| PIN | NAME | FUNCTION |
|---|---|---|
| 31 | SPI2_DIN | Data |
| 32 | SPI2_DOUT | Data |
| 33 | SPI2_SS_Z | Secondary Select |
| 34 | SPI2_CLK | Clock (up to 30MHz) |
| PIN | NAME | FUNCTION |
|---|---|---|
| 4 | ADC_MISO | Data |
| 5 | ADC_MOSI | Data |
| 17 | SEQ_CLK | Clock (30MHz) |
To avoid crosstalk, a PCB trace spacing requirement is suggested, such as the “3 W rule” which specifies that if the trace width is 5 mils, then traces should be spaced out at least 15 mils from center to center. On TI’s PCB design, the typical trace spacing was 20 mils.
As explained in the Section 6.3.1.4 section, the COMPOUT signal indicates the DLPC23x-Q1 that the discontinuous mode light pulses have been completed. This signal must have a fast response time to create small light pulses. For this reason, it is recommended that this signal has a limited trace capacitance, as mentioned in Table 9-8.
| PIN | NAME | PARAMETER | TYP | MAX | UNIT |
|---|---|---|---|---|---|
| 12 | COMPOUT | Trace capacitance | 20 | 50 | pF |