參數(shù)資料
型號(hào): TMS37122
廠商: Texas Instruments, Inc.
英文描述: TIRIS Automotive Devices Analog Front End IC TMS37122
中文描述: 提里斯汽車設(shè)備的模擬前端集成電路TMS37122
文件頁(yè)數(shù): 22/73頁(yè)
文件大小: 1189K
代理商: TMS37122
22
Analog Front End IC TMS37122 - Reference Guide
August ’01
2.3
Power-on-reset
The TMS37122 does not include a power-on-reset circuit, which supervises the battery volt-
age. The circuit is reset by the Microcomputer via the WDEEN input (WDEEN='0'). It is ex-
pected that the current Microcomputer RKE system is already equipped with an efficient reset
circuit securing an initialization in case of supply voltage drop below 2 V (2.2 V).
If the Battery Backup function is used, we recommend to use a Low Power Supervisory cir-
cuit (Isupply < 1 μA). One device that could be used is:
- TPS3836/37 (Texas Instruments)
Figure 9: Schematic of Reset Flow
RESET
RST
MICROCOMPUTER
VCC
VDD
TPS3836K25
GND
VSS
CT
OUT
WDEEN
TMS37122
GND
VBAT VCCO
MR
1
2
3
4
RESET
WDEEN
BATTERY
BACKUP
BATTERY LIFE TIME
VBAT
V
t
td
td
tinit
tinit
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