L99LD20 datasheet(51/61 Pages) STMICROELECTRONICS

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DS11366 Rev 3

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L99LD20

Electrical specifications

5.4.3

SPI

Note:

See also Chapter 4: SPI functional description.

Table 37. SPI signal description

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

CSN

Chip Select Not

High State

0.7 * V3V3

—

V3V3

Low State

—

0.3 * V3V3

SCK

Serial Clock

High State

0.7 * V3V3

—

V3V3

Low State

—

0.3 * V3V3

SDI

Serial data Input

High State

0.7 * V3V3

—

V3V3

Low State

—

0.3 * V3V3

SDO

Serial data Output - High State

IOUT = -1 mA

VSPI-0.5

VSPI-0.2

—

Serial data Output - Low State

IOUT = 1 mA

—

0.2

0.5

ILK

Output leakage current

—

-1

—

µA

Table 38. SPI timings

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

Tsck

Serial clock (SCK) period

250

THsck

SCK high time

100

TLsck

SCK low time

100

Trise_in

CSN, SCK, SDI rise time

Fsck = 4 MHz

Tfall_in

CSN, SCK, SDI fall time

Fsck = 4 MHz

THcsn

CSN high time

µs

TScsn

CSN setup time, CSN low

before SCK rising

100

TSsck

SCK setup time, SCK low

before CSN rising

100

TSsdi

SDI setup time before SCK

rising

Thold_sdi

SDI hold time

Tcsn_v

CSN falling until SDO valid

Cout = 50 pF;

Iout = ±1 mA

100

Tcsn_v

CSN rising until SDO tristate

Cout = 50 pF;

Iout = ±4 mA

100

Tsck_v

SCK falling until SDO valid

Cout = 50 pF

TRsdo

SDO rise time

Cout = 50 pF;

Iout = -1 mA

100

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