Users Manual

Table Of Contents

Thundercomm TurboX C865 System on Module

Frequency –

– – 24.576 MHz

T Clock period –

40.69 – – ns

t(HC) Clock high –

0.45 × T – 0.55 × T ns

t(LC) Clock low –

0.45 × T – 0.55 × T ns

t(sr) SD and WS input setup time –

8.14 – – ns

t(hr) SD and WS input hold time –

0 – – ns

t(dtr) SD and WS output delay –

– – 6.10 ns

Using externalSCK

Frequency – – – 24.576 MHz

T Clock period – 40.69 – – ns

t(HC) Clock high – 0.45 × T – 0.55 × T ns

t(LC) Clock low – 0.45 × T – 0.55 × T ns

t(sr) SD and WS input setup time – 8.14 – – ns

t(hr) SD and WS input hold time – 0 – – ns

t(dtr) SD and WS output delay – – – 6.10 ns

Table 4.11-2 I2S Timing

4.12 I2C

The SOM I2C standards and exceptions:

Applicable standard Feature exceptions

I2C Specification, version 3.0

HS mode, slave mode, multi-master mode, and

10-bit addressing are not supported.

Table 4.12-1 I2C

4.13 SPI

The SOM supports SPI standards as a master only.

4.14 Fuel gauge

The fuel gauge module offers a hardware-based algorithm that is able to accurately estimate the Battery’s state

of charge by using current monitoring and voltage-based techniques. This hybrid approach ensures both

excellent short-term linearity and long-term accuracy. Furthermore, neither full battery charge cycling, nor

zero-current-load conditions, are required to maintain the accuracy.

The fuel gauge measures the battery pack temperature by sensing the voltage across an external thermistor.

Missing battery detection is also incorporated to accurately monitor battery insertion and removal scenarios,

while properly updating the state of charge when a battery is reconnected.

Using precise measurements of battery voltage, current, and temperature, the fuel gauging algorithm

compensates for the variation in battery characteristics across temperature changes and aging effects. This