STP16CPC26PTR 查看數據表（PDF） - STMicroelectronics

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STP16CPC26PTR

Low voltage 16-bit constant current LED sink driver

STMicroelectronics 

Timing diagrams

STP16CPC26

8

Timing diagrams

The timing diagram shown in Figure 10: "Timing diagram" and the truth table in Table 7:

"Truth table" explain how to send data to the device. This can be summarized in the

following points:

 LE and OE are level sensitive and not synchronized with the CLK signal

 When LE is at low level, the latch circuit holds previous data

 If LE is high level, data present in the shift register are latched

 When OE is at low level, the status of the outputs OUT0 to OUT15 depends on the

data in the latch circuits

 With OE at high level, all outputs are switched off independently on the data stored

in the latch circuits

 Every rising edge of the CLK signal, a new data on SDI pin is sampled. This data is

loaded into the shift register, whereas a bit is shifted out from SDO

Figure 10: Timing diagram

Clock LE OE

_|¯ H

L

_|¯ L

L

_|¯ H

L

¯|_ X

L

¯|_ X

H

Serial-IN

Dn

Dn + 1

Dn + 2

Dn + 3

Dn + 3

Table 7: Truth table

OUT0 ............. OUT7 ................ OUT15 (1)

Dn ..... Dn - 7 ..... Dn -15

No change

Dn + 2 ..... Dn - 5 ..... Dn -13

Dn + 2 ..... Dn - 5 ..... Dn -13

OFF

Notes:

(1) OUTn = ON when Dn = H, OUTn = OFF when Dn = L.

SDO

Dn - 15

Dn - 14

Dn - 13

Dn - 13

Dn - 13

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DocID18469 Rev 6

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