MAX17823B datasheet(33/121 Pages) MAXIM

33 / 121 page

________________________________________________________________________________________________________________________________________________________________

MAX17823B

12-Channel High-Voltage Data Acquisition System

www.maximintegrated.com

Maxim Integrated | 33

Cell-Balancing Watchdog

Even if the host fails to disable the cell-balancing mode, the cell-balancing watchdog can automatically disable the

cell-balancing switches regardless of the BALSWEN configuration. The cell-balancing watchdog does not modify the

contents of the BALSWEN register. Use the WATCHDOG register to configure the timeout value from 1s to 3840s

(64min) as shown in Table 12. The pre-divider configuration CBPDIV[2:0] effectively sets the rate at which the

CBTIMER[3:0] counts down as shown in Figure 16.

CBPDIV

32.768kHz

CBTIMER

Timer Zero

Flag

Bit 0

Bit 1

Bit 2

Bit 3

CBPDIV1 CBPDIV0

BALSWEN

Cell Balancing

Switch Enable

CBTIMER

Enable

CBPDIV2

Figure 16. Cell-Balancing Watchdog

Table 12. Cell-Balancing Watchdog Configuration

CBPDIV[2:0]

Timer LSb Period

Range of CBTIMER[3:0]

Minimum

Maximum

000b

Timer Disabled

001b

15s

010b

60s

011b

16s

240s

100b

64s

960s

101b

128s

1920s

110b

256s

3840s

The host should periodically update CBTIMER to ensure that it does not count down to zero. If countdown timer is

allowed to reach zero, the cell balancing switches are disabled until the timer is either disabled or is refreshed by

writing a non-zero value.

To allow timed balancing with no host interaction, the GPIO3 pin is configured to output a logic high level while the

timer is counting using the GPIO3TMR configuration bit of the GPIO register. An external diode is connected from

GPIO3 to SHDNL to prevent shutdown while the timer is counting. Once the timer expires, the device shuts down.

The host may intervene prior to the timer expiring to keep the device active and to reconfigure the device.

MAX17823B Datasheet(PDF) 33 Page - Maxim Integrated Products

MAX17823B Datasheet(HTML) 33 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL