參數(shù)資料
型號(hào): MM912G634CV1AE
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 103/349頁(yè)
文件大小: 0K
描述: IC 48KS12 LIN2XLS/HS ISENSE
標(biāo)準(zhǔn)包裝: 250
應(yīng)用: 自動(dòng)
核心處理器: HCS12
程序存儲(chǔ)器類型: 閃存(48 kB)
控制器系列: HCS12
RAM 容量: 2K x 8
接口: LIN
電源電壓: 5.5 V ~ 27 V
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP 裸露焊盤(pán)
包裝: 托盤(pán)
供應(yīng)商設(shè)備封裝: 48-LQFP 裸露焊盤(pán)(7x7)
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MM912_634 Advance Information, Rev. 10.0
Freescale Semiconductor
191
This clock will be referred to as the target clock in the following explanation.
The BDM serial interface uses a clocking scheme in which the external host generates a falling edge on the BKGD pin to indicate
the start of each bit time. This falling edge is sent for every bit whether data is transmitted or received. Data is transferred most
significant bit (MSB) first at 16 target clock cycles per bit. The interface times out if 512 clock cycles occur between falling edges
from the host.
The BKGD pin is a pseudo open-drain pin and has an weak on-chip active pull-up that is enabled at all times. It is assumed that
there is an external pull-up and that drivers connected to BKGD do not typically drive the high level. Since R-C rise time could
be unacceptably long, the target system and host provide brief driven-high (speedup) pulses to drive BKGD to a logic 1. The
source of this speedup pulse is the host for transmit cases and the target for receive cases.
The timing for host-to-target is shown in Figure 55 and that of target-to-host in Figure 56 and Figure 57. All four cases begin when
the host drives the BKGD pin low to generate a falling edge. Since the host and target are operating from separate clocks, it can
take the target system up to one full clock cycle to recognize this edge. The target measures delays from this perceived start of
the bit time while the host measures delays from the point it actually drove BKGD low to start the bit up to one target clock cycle
earlier. Synchronization between the host and target is established in this manner at the start of every bit time.
Figure 55 shows an external host transmitting a logic 1 and transmitting a logic 0 to the BKGD pin of a target system. The host
is asynchronous to the target, so there is up to a one clock-cycle delay from the host-generated falling edge to where the target
recognizes this edge as the beginning of the bit time. Ten target clock cycles later, the target senses the bit level on the BKGD
pin. Internal glitch detect logic requires the pin be driven high no later that eight target clock cycles after the falling edge for a
logic 1 transmission.
Since the host drives the high speedup pulses in these two cases, the rising edges look like digitally driven signals.
Figure 55. BDM Host-to-Target Serial Bit Timing
The receive cases are more complicated. Figure 56 shows the host receiving a logic 1 from the target system. Since the host is
asynchronous to the target, there is up to one clock-cycle delay from the host-generated falling edge on BKGD to the perceived
start of the bit time in the target. The host holds the BKGD pin low long enough for the target to recognize it (at least two target
clock cycles). The host must release the low drive before the target drives a brief high speedup pulse seven target clock cycles
after the perceived start of the bit time. The host should sample the bit level about 10 target clock cycles after it started the bit time.
Target Senses Bit
10 Cycles
Synchronization
Uncertainty
BDM Clock
(Target MCU)
Host
Transmit 1
Host
Transmit 0
Perceived
Start of Bit Time
Earliest
Start of
Next Bit
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MM912G634CV1AER2 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 48KS12 LIN2xLS/HS Isense RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MM912G634CV2AP 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 48KS12 LIN2xLS/HS Isense RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
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MM912G634DM1AE 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 48KS12 LIN2xLS/HS Isense RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
MM912G634DM1AER2 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 48KS12 LIN2xLS/HS Isense RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube