SLIS093 Data sheet

SLIS093D March 2000 – March 2015 TPIC6C596

PRODUCTION DATA.

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）

PW|16
N|16
D|16

サーマルパッド・メカニカル・データ

発注情報

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TPIC6C596 device is a serial-in parallel-out, Power+LogicE 8-bit shift register with low-side switch DMOS outputs rating of a 100 mA per channel. The device is designed to drive resistive and inductive loads and is particularly well-suited as an interface between a microcontroller and LEDs or lamps. The TPIC6C596 device is an enhancement of the TPIC6C595 device, where the shift register serial output (SER OUT) is clocked on the falling edge of the serial clock to provide additional hold-time in applications where several devices are cascaded.

9.1.1 Cascaded Application

The serial output (SEROUT) clocks out of the device on the falling edge of SRCK to provide additional hold time for cascaded applications. Connect the device (SEROUT) pin to the next device (SERIN) for daisy Chain. This provides improved performance for applications where clock signals may be skewed, devices are not located near one another, or the system must tolerate electromagnetic interference.

TPIC6C596 schematic_of_inputs_outputs_slis093.gif

Figure 13. Schematic of Inputs and Outputs

9.2 Typical Application

The typical application of TPIC6C596 device is an automotive cluster driver. In this example, two TPIC6C596 power shift registers are cascaded and used to turn on LEDs in the cluster panel. In this case, the LED must be updated after all 16 bits of data have been loaded into the serial shift registers. The MCU outputs the data to the serial input (SER IN) while clocking the shift register clock (SRCK). After the 16th clock, a pulse to the register clock (RCK) transfers the data to the storage registers. If output enable (G) is low, then the LEDs are turned on corresponding to the status word with ones being on and zeros off. With this simple scheme, MCU can use the SPI interface to turn on 16 LEDs using only two ICs as illustrated in Figure 14.

Figure 14. Typical Application Schematic

9.2.1 Design Requirements

Table 1 lists the design parameters for Figure 14.

Table 1. Design Parameters

DESIGN PARAMTER	EXAMPLE VALUE
Vsupply	9 to16 V
V (D1), V (D2), V (D3), V (D4), V (D5), V (D6),V (D7), V (D8)	2 V
V (D9), V (D10),V (D11), V (D12), V (D13), V (D14),V (D15), V (D16)	3.3 V
I (D1), I (D2), I (D3), I (D4), I (D5), I (D6),I (D7), I (D8)	20 mA when Vbattery is 12 V
I (D9), I (D10), I (D11), I (D12), I (D13), I (D14),I (D15), I (D16)	30 mA when Vbattery is 12 V

9.2.2 Detailed Design Procedure

To begin the design process, the designer must decide on a few parameters. The designer must know the following:

Vsupply: LED supply is connected directly to the car battery, which has a voltage range from 9 V to 16 V, or fixed voltage. This application connects to the battery directly.
V(Dx): LED forward voltage
I(Dx): LED setting current when battery is 12 V.

9.2.2.1 R1, R2, R3, R4, R5, R6, R7, R8 R1 = R2 = R3 = R4 = R5 = R6 = R7 = R8 =
(Vsupply – V (Dx)) / I (Dx) = (12 V – 2 V) / 0.02 A = 500 Ω

When Vsupply is 9 V, I (D1) = I (D2 ) = I (D3) = I (D4) = I (D5) = I (D6) = I (D7) = I (D8) = (Vsupply – V(Dx) ) / Rx = 14 mA.

When Vsupply is 16 V, I (D9) = I (D10) = I (D11) = I (D12) = I (D13) = I (D14) = I (D15) = I (D16) =(Vsupply – V(Dx)) / Rx= 43.8 mA.