TDC-GP30 datasheet(13/89 Pages) AMSCO

13 / 89 page

Ultrasonic Flow Converter

Vol. 1

TDC-GP30

2-4

www.acam.de

DB_GP30Y_Vol1_en.docx V0.0

2.2

Timings

At Vcc = 3.0 V ± 0.3 V, ambient temperature -40 °C to +85 °C unless otherwise specified

2.2.1

Oscillators

Table 2-9 Oscillator specifications

Symbol

Parameter

Min.

Typ.

Max.

Unit

LSO_CLK

32 kHz reference oscillator

32.768

kHz

STLSO

32 kHz oscillator start-up time after power-up

< 1

Sec.

HSO_CLK

High-speed reference oscillator

MHz

STHSO_CER

Oscillator start-up time with ceramic resonator

<100

µs

STHSO_CRY

Oscillator start-up time with crystal oscillator

(not recommended)

Remark:

It is strongly recommended that a ceramic oscillator be used for HSO_CLK because a quartz oscillator needs

much longer time to settle than a ceramic oscillator. This consumes a lot of current, but using a quartz oscillator

has no advantage when high speed clock calibration is done as supported by GP30.

2.2.2

Power-On

Table 2-10 Power-on timings

Symbol

Parameter

Min.

Typ.

Max.

Unit

tVDD18_STB

Time when VDD18 is stable after power on of VCC

(CL=100µF on VDD18_OUT)

tRC_RLS

Time when remote communication is released after power

on of VCC

t.b.d.

2.2.3

UART Interface

Table 2-11UART timings

Symbol

Parameter

Min.

Typ.

Max.

Unit

Baud rate

4800

115200

bps

tBIT

Bit time (baud rate = 4800 Baud)

208.33

µs

Bit time (Baudrate = 115200 Baud)

8.68

µs

tIBG

Inter-Byte Gap

tBIT

Figure 2-1 UART timing

tIBG

tBIT

2.2.4

SPI Interface

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