AS3421 datasheet(27/61 Pages) AMSCO

27 / 61 page

www.austriamicrosystems.com

Revision 0.90

27 - 61

AS3421 AS3422

Datasheet - D e t a i l e d D e s c r i p t i o n

9.8.2

Parameter

Figure 34. 2-Wire Serial Timing

VBAT >=1.4V

, TA=25ºC, unless otherwise specified.

Table 14. 2-Wire Serial Parameter

Symbol

Parameter

Condition

Min

Typ

Max

Unit

VCSL

CSCL, CSDA Low Input Level

(max 30%VBAT)

0.42

VCSH

CSCL, CSDA High Input Level

CSCL, CSDA (min 70%VBAT)

0.98

HYST

CSCL, CSDA Input Hysteresis

200

450

800

VOL

CSDA Low Output Level

at 3mA

0.4

Tsp

Spike insensitivity

100

Clock high time

max. 400kHz clock speed

500

Clock low time

max. 400kHz clock speed

500

TSU

CSDA has to change Tsetup before rising edge

of CSCL

250

THD

No hold time needed for CSDA relative to rising

edge of CSCL

CSDA H hold time relative to CSDA edge for

start/stop/rep_start

200

TPD

CSDA prop delay relative to low going edge of

CSCL

1. Serial interface operates down to VBAT = 1.0V but with 100kHz clock speed and degraded parameters.

1-7

CSCL

CSDA

1-7

Start

Condition

Address

R/W

ACK

Data

ACK

Data

ACK

Stop

Condition

TSU

THD

TPD

AS3421 Datasheet(PDF) 27 Page - ams AG

AS3421 Datasheet(HTML) 27 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

Datasheet Download

Link URL