ADUC7032-8L
ObsoleteIntegrated Precision Battery Sensor for Automotive System
Part Details
- Operates directly from 12 V battery supply
Current consumption
- Normal mode: 10 mA at 10 MHz
- Low power monitor mode: 175 µA
- Dual channel, simultaneous sampling, 16-bit Σ-Δ ADCs
- Third independent ADC for temperature sensing
- Programmable ADC throughput from 1 Hz to 8 kHz
- On-chip 5 ppm/°C voltage reference
- Current channel
Fully differential, buffered input
Programmable gain: 1 to 512
ADC input range: −200 mV to +300 mV
Digital comparators, with current accumulator feature - Voltage channel
Buffered, on-chip attenuator for 12 V battery inputs - Temperature channel
External and on-chip temperature sensor options
- 96 kB Flash/EE memory, 6 kB SRAM
10k-cycle Flash/EE endurance, 20-year Flash/EE retention
In-circuit download via JTAG and LIN
64 × 16-bit result FIFO for current and voltage ADC - Package and temperature range
48-lead, 7 mm × 7 mm LQFP
Fully specified for −40°C to +105°C operation
- ARM7TDMI core, 16-/32-bit RISC architecture
- 20.48 MHz PLL with programmable divider
- PLL input source
On-chip precision oscillator
On-chip low power oscillator
External (32.768 kHz) watch crystal - JTAG port supports code download and debug
- LIN 1.3- and 2.0-compatible (slave) support via UART with hardware synchronization
- Flexible wake-up I/O pin, master/slave SPI serial I/O
- 9-pin GPIO port, 2× general-purpose timers
- Wake-up and watchdog timers
- Power supply monitor, on-chip power-on reset
The ADuC7032-8L is a complete system solution for battery monitoring in 12 V automotive applications. The device integrates all of the required features to precisely and intelligently monitor, process, and diagnose 12 V battery parameters, including battery current, voltage, and temperature, over a wide range of operating conditions.
Minimizing external system components, the device is powered directly from the 12 V battery. An on-chip, low dropout (LDO) regulator generates the supply voltage for the three integrated 16-bit ADCs. The ADCs precisely measure battery current, voltage, and temperature, which can be used to characterize the state of health and charge of a car battery.
A Flash/EE memory-based ARM7™ microcontroller (MCU) is also integrated on-chip and is used both to preprocess the acquired battery variables and to manage communications from the ADuC7032-8L to the main electronic control unit (ECU) via a local interconnect network (LIN) interface, which is integrated on-chip.
Both the MCU and the ADC subsystem can be individually configured to operate in normal or flexible power saving modes of operation.
In its normal operating mode, the MCU is clocked indirectly from an on-chip oscillator via the phase-locked loop (PLL) at a maximum clock rate of 20.48 MHz. In its power-saving operating modes, the MCU can be totally powered down, waking up only in response to an ADC conversion result ready, digital comparators, the wake-up timer, a power-on reset (POR), or an external serial communication event.
The ADC can be configured to operate in a normal (full-power) mode of operation, interrupting the MCU after various sample conversion events. The current channel features two low power modes: low power and low power plus, generating conversion results to a lower performance specification.
On-chip factory firmware supports in-circuit Flash/EE memory reprogramming via the LIN or JTAG serial interface ports, and nonintrusive emulation is also supported via the JTAG interface. These features are incorporated into a low cost QuickStart™ Plus development system supporting the ADuC7032-8L.
The ADuC7032-8L operates directly from the 12 V battery supply and is fully specified over a temperature range of −40°C to +105°C. The ADuC7032-8L is functional, with degraded performance, at temperatures from 105°C to 125°C.
Applications
Documentation
This is the most up-to-date revision of the Data Sheet.
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