SM5837AF datasheet(7/8 Pages) NPC

7 / 8 page

SM5837AF

NIPPON PRECISION CIRCUITS—7

Serial Input Set Method

(PARA, SDI, SICK, LEN)

When PARA goes LOW, 3-input serial data set

method is used to set the delay length. Inputs DL3 to

DL10 are ignored. SDI, SICK and LEN function as

the serial data input, serial data shift clock and latch

clock enable, respectively.

The serial input data format, shown in ﬁgure XREF,

comprises 11-bit serial data (S0 to S10) input on SDI

in sync with SICK. The data on SDI is clocked into

00111100010

513

↓↓↓↓↓↓↓↓↓↓↓

↓

01111100001

1024

01111100010

1025

↓↓↓↓↓↓↓↓↓↓↓

↓

11111100001

2048

11111100010

2049

↓↓↓↓↓↓↓↓↓↓↓

↓

11111111110

2077

11111111111

2078

Table 1. Delay bit length setting

DL10

DL9

DL8

DL7

DL6

DL5

DL4

DL3

DL2

DL1

DL0

Delay length

the serial-to-parallel converter shift register on the

rising edge of SICK, and 11-bit parallel data is then

latched into the delay length set register on the rising

edge of LEN.

The delay length (LH) is determined by the input

data S0 to S10 (just as for parallel input data DL0 to

DL10) as shown in equation 2. See also table 1.

Note that SICK and CLK can be asynchronous.

(2)

{}

∑

Delay Clock Input (CLK)

All 1H delay registers operate in sync with the delay

clock CLK. The maximum clock frequency is 40

MHz.

Input Data (DI0 to DI11)

DI0 to DI11 are the 12-bit data inputs.

Dotted lines indicate possible SICK and LEN states.

Figure 1. Serial input data format

S10

SDI

SICK

LEN

Output Data (DO0 to DO11,OE)

DO0 to DO11 are the 12-bit data outputs. They are

tristate outputs, with the output state selected by OE.

When OE is HIGH, the outputs are enabled. When

OE is LOW, the outputs are disabled (high-imped-

ance state).

Reset (RSTN)

At power-ON, the internal timing generator circuits

must be initialized by a LOW-level input on RSTN.

After RSTN goes HIGH, the set delay length

becomes active.

SM5837AF Datasheet(PDF) 7 Page - Nippon Precision Circuits Inc

SM5837AF Datasheet(HTML) 7 Page - Nippon Precision Circuits Inc

Html Pages

1 2 3 4 5 6 7 8

Datasheet Download

Link URL