TS3005 datasheet(8/11 Pages) TOUCHSTONE

номер детали	TS3005

подробное описание детали	A 1.55V to 5.25V, 1.35uA, 1.7ms to 33hrs Silicon Timer

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производитель	TOUCHSTONE [Touchstone Semiconductor Inc]

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TS3005

Page 8

TS3005DS r1p0

RTFDS

With an RSET = 4.32MΩ and FDIV2:0=111, the FOUT

period is approximately 715.88 minutes with a 50%

duty cycle. As design aids, Tables 2 lists TS3004

’s

typical FOUT period for various standard values for

RSET and FDIV2:0 = 111(7).

The output period can be user-adjusted from 1.7ms

to 33hrs without additional components. Frequency

divider inputs FDIV2:0 can be set to a logic state

HIGH or LOW in order to set the desired frequency

as shown in to Table 1.

The TS3005 also provides a separate PWM output

signal at its PWMOUT terminal that is anti-phase with

respect to FOUT. A dead time of approximately

106ns exists between FOUT and PWMOUT. To

adjust the pulse width of the PWMOUT output, a

single capacitor can be placed at the CPWM pin. To

determine the capacitance needed for a desired

pulse width, the following equation is to be used:

C WM( =

ulse Width(s x C WM

VC WM 300mV

Equation 2. CPWM Capacitor Calculation

where ICPWM and VCPWM is the current supplied and

voltage applied to the CPWM capacitor, respectively.

The pulse width is determined based on the period of

FOUT and should never be greater than the period at

FOUT. Make sure the PWM_CNTRL pin is set to at

least 400mV when calculating the pulse width of

PWMOUT. Note VCPWM is approximately 300mV,

which is the RSET voltage. Also note that ICPWM is

either 1µA or 100nA. Refer to Table 1.

The PWMOUT output pulse width can be adjusted

further after selecting a CPWM capacitor This can be

achieved by applying a voltage to the PWM_CNTRL

pin between VRSET and GND. With a voltage of at

least VRSET, the pulse width is set based on Equation

2. For example, with a period of 20.5ms( 49Hz) a

10nF capacitor at the CPWM pin generates a pulse

width of approximately 3ms. This can be calculated

using equation 2. By reducing the PWM_CNTRL

voltage from VRSET

300mV to GND, the pulse width

can be reduced further. Note that as the FOUT

frequency increases, the amount of pulse width

reduction reduces and vice versa. Furthermore, if the

PWMOUT output is half the frequency of the FOUT

output, this means your CPWM capacitor is too large

and as a result, the pulse width is greater than the

FOUT period. In this case, use Equation 2 and

reduce the capacitor value to less than the period.

Connect CPWM to VDD to disable the PWM function

and in turn, save power. Connect PWM_CNTRL to

VDD for a fixed PWMOUT output pulse width, which

is determined by the CPWM pin capacitor only.

APPLICATIONS INFORMATION

Minimizing Power Consumption

To keep the TS3005

’s power consumption low,

resistive loads at the FOUT and PWMOUT terminals

increase dc power consumption and therefore should

be as large as possible. Capacitive loads at the

FOUT

and

PWMOUT

terminals

increase

the

TS3005

’s transient power consumption and, as well,

should be as small as possible.

One challenge to minimizing the TS3005

’s transient

power consumption is the probe capacitance of

oscilloscopes and frequency counter instruments.

Most instruments exhibit an input capacitance of

15pF or more. Unless buffered, the increase in

transient load current can be as much as 400nA.

To minimize capacitive loading, the technique shown

in Figure 1 can be used. In this circuit, the principle of

series-connected capacitors can be used to reduce

the effective capacitive load at the TS3005

’s O T

and PWMOUT terminals.

To determine the optimal value for CEXT once the

probe capacitance is known by simply solving for

CEXT

using

the

following

expression:

or example, if the instrument’s input probe

capacitance is 15pF and the desired effective load

Figure 1: Using an External Capacitor in Series with

Probes Reduces Effective Capacitive Load.

C T =

1

C OA (

1

C RO

Equation 3:External Capacitor Calculation

Аналогичный номер детали - TS3005

производитель	номер детали	датащи	подробное описание детали
Silicon Laboratories	TS3005	1Mb / 12P	Single Resistor Sets Output Frequency
Touchstone Semiconducto...	TS3005DB	346Kb / 4P	A 1.55V to 5.25V, 1.35關A, 1.7ms to 33hrs Silicon Timer
Silicon Laboratories	TS3005ITD1033	1Mb / 12P	Single Resistor Sets Output Frequency
Silicon Laboratories	TS3005ITD1033T	1Mb / 12P	Single Resistor Sets Output Frequency

More results

Аналогичное описание - TS3005

производитель	номер детали	датащи	подробное описание детали
Touchstone Semiconducto...	TS3005DB	346Kb / 4P	A 1.55V to 5.25V, 1.35關A, 1.7ms to 33hrs Silicon Timer
	TS3003	868Kb / 10P	A 1.55V to 5.25V, 10kHz to 300kHz Silicon Timer
	TS3006DB	305Kb / 3P	A 1.55V to 5.25V, 1.9A, 9kHz to 300kHz Silicon Timer
	TS3003DB	332Kb / 4P	A 1.55V to 5.25V, 1.9A, 9kHz to 300kHz Silicon Timer
	TS3006	641Kb / 9P	A 1.55V to 5.25V, 1.9uA, 9kHz to 300kHz Silicon Timer
	TS3004	835Kb / 11P	A 1.55V to 5.25V, 1.9uA, 3.3us to 233s Silicon Timer
	TS3002	889Kb / 11P	A 1V/1uA Easy-to-Use Silicon Oscillator/Timer
Maxim Integrated Produc...	MAX5498EVKIT	313Kb / 13P	2.7V to 5.25V Single-Supply Operation Rev 1; 12/08
	MAX3524EVKIT	151Kb / 5P	4.75V to 5.25V Single-Supply Operation Rev 0; 12/00
	MAX98307EVKIT	1Mb / 7P	2.6V to 5.25V Single-Supply Operation 19-5985; Rev 0; 7/11

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