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您好,
FDC2214 采样阶段包括3部分:1. sensor activation time 2. conversion time 3. channel switch delay
转换过程每个阶段时间加起来,得到的这个时间的倒数,即是采样速率
看datasheet figure13和figure14,如果要工作在最快采样速率时,就需要工作在单通道连续转换模式下;
因此 settling wait time计算公式:
tSx = (CHX_SETTLECOUNTˣ16)/fREFx
The SETTLECOUNT for any channel x must satisfy:
CHx_SETTLECOUNT > Vpk × fREFx × C × π 2 / (32 × IDRIVEX)
where
• Vpk = Peak oscillation amplitude at the programmed IDRIVE setting
• fREFx = Reference frequency for Channel x
• C = sensor capacitance including parasitic PCB capacitance
• IDRIVEX = setting programmed into the IDRIVE register in amps
同时 conversion time计算公式:
tCx = (CHx_RCOUNT ˣ 16 + 4) /fREFx
因此还与reference frequency有关;
是的,通过REF_CLK_SRC选择时钟源;
还有与传感器电流驱动有关的寄存器,如 datasheet Table 9中列出的 Current Drive Control Registers