MICRF506 datasheet(12/28 Pages) MICREL

12 / 28 page

Micrel

MICRF506

September 2004

M9999-092904

(408) 955-1690

Values

Symbol

Parameter

Min.

Typ.

Max.

Units

Tper

Min. period of

SCLK

Thigh

Min. high time of

SCLK

Tlow

Min. low time of

SCLK

tfall

Max. time of

falling edge of

SCLK

1ns

trise

Max. time of rising

edge of SCLK

1ns

Tcsr

Max. time of rising

edge of CS to

falling edge of

SCLK

0ns

Tcsf

Min. delay from

rising edge of CS

to rising edge of

SCLK

5ns

Twrite

Min. delay from

valid IO to falling

edge of SCLK

during a write

operation

0ns

Tread

Min. delay from

rising edge of

SCLK to valid IO

during a read

operation

(assuming load

capacitance of IO

is 25pF)

Table 6. Timing Specification for the 3-wire

Programming Interface

Programming summary

•

Use CS, SCLK, and IO to get access to the

control registers in MICRF506.

•

SCLK is user-controlled.

•

Write to the MICRF506 at positive edges

(MICRF506 reads at negative edges).

•

Read from the MICRF506 at negative edges

(MICRF506 writes at positive edges)

•

After power-on: Write to the complete set of

control registers.

•

Address field is 7 bits long. Enter msb first.

•

R/W bit is 1 bit long (“1” for read, “0” for

write)

•

Address and R/W bit together make 1 octet

•

All control registers are 8 bits long.

Enter/read msb in every octet first.

•

Always write 8 bits to/read 8 bits from a

control register. This is the case for registers

with less than 8 used programming bits as

well.

•

Writing: Bring CS high, write address and

R/W bit followed by the new values to fill into

the addressed control register(s) and bring

CS low for loading, i.e. activation of the new

control register values (“load_en” = 1).

•

Reading: Bring CS high, write address and

R/W bit, set IO as an input, read present

contents of the addressed control

output.

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