LR44 battery.ltc6802 Chinese information_Pin diagram_Internal structure diagram and application circuit

LTC6802 Chinese information_Pin diagram_Internal structure diagram and application circuit - This article focuses on LTC6802 and mainly introduces the pin diagram and functions of LTC6802, the typical application circuit of LTC6802, the internal structure diagram of LTC6802 and its related characteristics. LTC6802 Introduction

LTC6802 is a battery monitoring chip that includes a 12-bit resolution analog-to-digital converter, a high-precision voltage reference source, a high-voltage input multiplexer and a serial interface. Each LTC6802 can measure the voltage of 12 series-connected batteries, with a maximum allowed measurement voltage of 60 volts. All battery voltages can be monitored simultaneously or any cell in a series of batteries can be monitored individually. The chip uses a unique level-shifting serial interface, and multiple LTC6802s can be directly connected in series without the need for optocouplers or isolation devices between chips.

Multiple LTC6802s can work simultaneously when connected in series, and the voltage measurement time of all series-connected batteries is within 13ms. In order to reduce power consumption, the LTC6802 can also monitor the overvoltage and undervoltage status of each battery in real time. Each battery input terminal of the chip is internally connected with a MOS switch for discharging overcharged batteries.
LTC6802 pin diagram and pin functions:

V+: Connect the positive terminal of the power supply. V+ must be at the same potential as C12.

C12, C11, C10, C9, C8, C7, C6, C5, C4, C3, C2, C1 (pins2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24):

C1~C12 are voltage monitoring input pins, which can monitor up to 12 batteries. C1 is connected to V-, C2 is connected to C1, and so on.

S12, S11, S10, S9, S8, S7, S6, S5, S4, S3, S2, S1 (pins3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25)

S1S12 and used for cell balancing. If one cell of the series battery is overcharged, the S pin can be used to discharge it.

V-: Connect the negative terminal of the battery

NC: Internally connected to V- through a 10 ohm resistor. NC- can be left floating or connected to V-.

VTEMp1, VTEMp2: Temperature sensor input. The ADC can measure the voltage on VTEMpx and store the result in the temperature register. The ADC's measurement is relative to the VREF pin voltage. Therefore, a simple thermistor and resistor combination connected to the VREF pin can be used to monitor the temperature. The VTEMp input can also be used as a general purpose ADC input.

VREF: 3.075V reference voltage output. This pin must be connected to a 1F bypass capacitor. The VREF pin can be connected to V- to drive a 100k resistive load. Larger loads should be connected to an LT6003 operational amplifier, or similar device.

VREG: Linear regulator output voltage. This pin should be connected to a 1F bypass capacitor. This pin cannot reduce current.

TOS: Top of stack input. It will be connected to VREF or V-.TOS pin changes the state of SDO operation intogglepollingmode.

MMB: Monitor mode input (active low). When MMB is low (at the same potential as V-), the LTC6802-2 enters monitor mode.

WDTB: Watchdog timer output (active low). If the SCI pin is inactive for 2.5 seconds, it is activated, the output and V- are turned on, and all configuration registers are reset.

watchdog

GpIO1, GpIO2: General purpose input/output. The operation of these pins depends on the state of the MMB pin. When MMB=0, GpIOpinsandtheWDTBpins are used to set the number of monitored batteries.

A0, A1, A2, A3 (pins37, 38, 39, 40): address input. These pins are connected to VREG or V-. The state of this address pin (VREG=1, V=0) determines the address of the LTC6802-2.

SCKI: Serial clock input. The SCKI is connected to any logic TTL level.SDI: Serial Data Input.

SDO: Serial data output. The SDO pin is an NMOS open-drain output and requires an external resistor to pull up.

CSBI: chip select (low level) input
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