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參數資料

型號：	LC80101M
元件分類：	消費家電
英文描述：	SPECIALTY CONSUMER CIRCUIT, PDSO28
封裝：	MFP-28
文件頁數：	4/9頁
文件大小：	161K
代理商：	LC80101M

Pin Assignment

Notes on the pull-up resistor used between the LC72700E pin 32 (DO) and this LSI’s pin 5 (DI1)

The value of the pull-up resistor Rp1 must be determined based on the printed circuit board’s floating capacitance and the

LC80101M’s clock. The time tCL for the LC80101M clock is 1.1 s (corresponding to 450 kHz). This clock is used as

the readout clock output to the LC72700E during the period discussed in note 1 for the basic timing of the external

interface as discussed on page 7. If the tCL of the CL2 clock from the microprocessor is longer than the tCL of the

LC80101M clock, a tCL of 1.1 s must be used in the formulas below. If the tCL of that clock is shorter than that of the

LC80101M clock, then the tCL of CL2 must be substituted in the formulas below.

For example, in the configuration shown in the figure above, assuming the tCL of CL2 is 1.0 s (i.e. CL2 = 500 kHz),

then:

T = tCL – 555 ns (the LC72700E data output time)

Since

≈ 2.2 (C1 + C2) R

Rp1

≈

Assuming that C1 = 10 pF and C2 = 10 pF, then Rp1 will be

≤ 10.1 k. These considerations must be used as guidelines

when determining the value of the pull-up resistor Rp1.

No. 5438-4/9

LC80101M

445 ns

2.2 (C1 + C2)

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