TMS3637 datasheet(21/53 Pages) TI

21 / 53 page

5–3

After a minimum valid time of tv = 10 µs, apply the high-voltage programming pulse to

permanently store the 31 code bits in EEPROM memory as shown in Figure 5–2. As stated in

steps 4 and 5, exactly 4 reset and 31 clock pulses must be applied for the device to successfully

program. The device does not transfer the code from its registers into the EEPROM if less than

or greater than 4 reset and 31 clock pulses are used before the programming pulse is applied.

15 V

OSCC

OSCR

(clock in)

VCC

(data in)

OSCR

(clock)

(data in)

C01

C02

C03

C04

C22

tw7

tw6

5 V

th1 > 1 µs

tsu4 > 1 µs

4 Reset Pulses

22 Security Bits

5.5 V

5 V

9 Configuration Bits

C01– C22

CA– CI

OUT

(previous data)†

tsu3

High-Voltage

Programming Pulse

† Previous data refers to data that was previously programmed into the device. If programmed for first time, this contains

a random test code from the factory.

Figure 5–2. EEPROM Write Mode

5.3

Internal Oscillator Operation for Transmit and Receive Modes Setting

Frequency

The TMS3637 has an internal oscillator that can be used in either the transmit or receive configurations of

the device. The oscillator free-running frequency (fosc) is controlled by an external resistor and capacitor

and is determined by:

fosc = 5 / (4 × Cosc × Rosc)

(1)

where

Cosc = capacitor from OSCC to GND

Rosc = resistor from OSCR to GND

The allowable oscillation range or Rosc versus VCC, and associated fosc values, and range versus Cosc for

three given values of Rosc are given in Section 4.

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