米6体育平台手机版

ZHCSGP5C August 2017 – February 2022 TIC12400-Q1

PRODUCTION DATA

封装选项

机械数据 (封装 | 引脚)

DCP|38
- MPDS520B

散热焊盘机械数据 (封装 | 引脚)

DCP|38
- PPTD170A

订购信息

9.3.1 Design Requirements

Figure 9-6 Example 3-state Resistor-Coded Switch

Table 9-4 Example Resistor-Coded Switch Specification

	SPECIFICATION	MIN	MAX
V_BAT	9 V ≤ V_BAT ≤ 16 V	9 V	16 V
R₁	680 Ω ± 8%	625.6 Ω	734.4 Ω
R_SW1	50 Ω Max when closed	0 Ω	50 Ω
R_SW2	50 Ω Max when closed	0 Ω	50 Ω
R_DIRT	5000 Ω Min	5000 Ω	∞
V_{GND_SHIFT}	±1 V	-1 Ω	+1 Ω

An example of a 3-state resistor-coded switch is shown in Figure 9-6, with Table 9-4 summarizing its detailed specification. The goal of this design is to utilize the TIC12400-Q1’s integrated ADC to detect and differentiate the 3 switch states:

State 1: Both SW1 and SW2 open.
State 2: SW1 open and SW2 close.
State 3: SW1 close and SW2 open.

To mimic real automotive systems, the battery is assumed to be fluctuating between 9 V and 16 V. R_DIRT is introduced to model the small leakage flowing across the switch in open state. There is also a ±1 V ground shift present in the system, meaning there could be up to ±1 V of potential difference between the switch reference point and the ground reference of the TIC12400-Q1. When the switch changes position and the switch state changes from one to another, the TIC12400-Q1 is required to correctly detect the state transition and issue an interrupt to alert the microcontroller. The switch information needs to be stored in the status registers for the microcontroller to retrieve.