ZHCSMY8B September 2020 – January 2022 BQ769142
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
-
7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 ESD Ratings
- 7.3 Recommended Operating Conditions
- 7.4 Thermal Information BQ769142
- 7.5 Supply Current
- 7.6 Digital I/O
- 7.7 LD Pin
- 7.8 Precharge (PCHG) and Predischarge (PDSG) FET Drive
- 7.9 FUSE Pin Functionality
- 7.10 REG18 LDO
- 7.11 REG0 Pre-regulator
- 7.12 REG1 LDO
- 7.13 REG2 LDO
- 7.14 Voltage References
- 7.15 Coulomb Counter
- 7.16 Coulomb Counter Digital Filter (CC1)
- 7.17 Current Measurement Digital Filter (CC2)
- 7.18 Current Wake Detector
- 7.19 Analog-to-Digital Converter
- 7.20 Cell Balancing
- 7.21 Cell Open Wire Detector
- 7.22 Internal Temperature Sensor
- 7.23 Thermistor Measurement
- 7.24 Internal Oscillators
- 7.25 High-side NFET Drivers
- 7.26 Comparator-Based Protection Subsystem
- 7.27 Timing Requirements - I2C Interface, 100kHz Mode
- 7.28 Timing Requirements - I2C Interface, 400kHz Mode
- 7.29 Timing Requirements - HDQ Interface
- 7.30 Timing Requirements - SPI Interface
- 7.31 Interface Timing Diagrams
- 7.32 Typical Characteristics
- 8 Device Description
- 9 Device Configuration
-
10Measurement Subsystem
- 10.1 Voltage Measurement
- 10.2 General Purpose ADCIN Functionality
- 10.3 Coulomb Counter and Digital Filters
- 10.4 Synchronized Voltage and Current Measurement
- 10.5 Internal Temperature Measurement
- 10.6 Thermistor Temperature Measurement
- 10.7 Factory Trim of Voltage ADC
- 10.8 Voltage Calibration (ADC Measurements)
- 10.9 Voltage Calibration (COV and CUV Protections)
- 10.10 Current Calibration
- 10.11 Temperature Calibration
- 11Primary and Secondary Protection Subsystems
-
12Device
Hardware Features
- 12.1 Voltage References
- 12.2 ADC Multiplexer
- 12.3 LDOs
- 12.4 Standalone Versus Host Interface
- 12.5 Multifunction Pin Controls
- 12.6 RST_SHUT Pin Operation
- 12.7 CFETOFF, DFETOFF, and BOTHOFF Pin Functionality
- 12.8 ALERT Pin Operation
- 12.9 DDSG and DCHG Pin Operation
- 12.10 Fuse Drive
- 12.11 Cell Open Wire
- 12.12 Low Frequency Oscillator
- 12.13 High Frequency Oscillator
- 13Device Functional Modes
- 14Serial Communications Interface
- 15Cell Balancing
- 16Application and Implementation
- 17Power Supply Requirements
- 18Layout
- 19Device and Documentation Support
- 20Mechanical, Packaging, Orderable Information
16.4 Startup Timing
At initial power up of the BQ769142 device from a SHUTDOWN state, the device progresses through a sequence of events before entering NORMAL mode operation. These are described below for an example configuration, with approximate timing shown for the cases when [FASTADC] = 0 and [FASTADC] = 1.
| Step | Comment | FASTADC Setting | Time (relative to wakeup event) |
|---|---|---|---|
| Wakeup event | Either the TS2 pin is pulled low, or the LD pin is pulled up, triggering the device to exit SHUTDOWN mode. | 0, 1 | 0 |
| REG1 powered | This was measured with the OTP programmed to autonomously power the REG1 LDO. | 0, 1 | 20 ms |
| INITSTART asserted | This was measured with the OTP programmed to provide the INITSTART bit in the Alarm signal on the ALERT pin. | 0, 1 | 23 ms |
| INITCOMP and ADSCAN asserted | This was measured with the OTP programmed to provide the INITCOMP and ADSCAN bits in the Alarm signal on the ALERT pin. | 0 | 88 ms |
| 1 | 58 ms | ||
| FULLSCAN asserted | This was measured with the OTP programmed to provide the FULLSCAN bit in the Alarm signal on the ALERT pin. | 0 | 221 ms |
| 1 | 129 ms | ||
| FETs enabled | This was measured with the OTP programmed to autonomously enable FETs. | 0 | 282 ms |
| 1 | 284 ms |
Figure 16-5 shows an example of an oscilloscope plot of a startup sequence with the device configured in OTP with [FASTADC] = 1, [FET_EN] = 1 for autonomous FET control, setup to use three thermistors, and providing the [INITCOMP] flag on the ALERT pin. The TS2 pin is pulled low to initiate device wakeup from SHUTDOWN.
Figure 16-5 Startup Sequence Using [FASTADC] = 1, with the [INITCOMP] Flag Displayed on the ALERT Pin