MC9328MX1_06 Datasheet, PDF (62/100 Pages) Freescale Semiconductor, Inc – MX Family of applications processors

Functional Description and Application Information
4.6.4 Gain Error Calculations
Gain error calculations are made using the information in this section.
Sample
65535
Smax
Gmax
G0
C0
- 2400
Vi
1800
2400
Figure 36. Gain Error Calculations
Assuming the offset remains unchanged, the mapping is rotated around y-intercept to determine the
maximum gain allowed. This occurs when the sample at 1800mV has just reached the ceiling of the 16-bit
range, 65535.
Maximum Offset G_max,
G_max
= (65535 - C₀₎ / 1800
= (65535 - 32767) / 1800
= 18.20
Gain Error G_r,
G_r
= (G_max - G₀) / G₀ * 100%
= (18.20 - 13.65) / 13.65 * 100%
= 33%
4.7 Bluetooth Accelerator
CAUTION
On-chip accelerator hardware is not supported by software. An external
Bluetooth chip interfaced to a UART is recommended.
The Bluetooth Accelerator (BTA) radio interface supports the Wireless RF Transceiver, MC13180 using
an SPI interface. This section provides the data bus timing diagrams and SPI interface timing diagrams
shown in Figure 37 and Figure 38, and the associated parameters shown in Table 22 and Table 23.
MC9328MX1 Technical Data, Rev. 7
62
Freescale Semiconductor